March update
I've not given up on this dream and if anything my hyper-focus has become more intense! I just wanted to avoid making a weekly "I'm still researching" post that contained nothing substantiative (seen way too many YouTube channels that do this just to keep their stats up

).
I've built up a list of auction sites and bus dealers that I now check about 3x a week looking for "the one." So, far, obviously, not much luck

. I'm just too picky! I've ranked my needs/wants and at a certain point will have to pull the trigger on an "almost ideal" bus but for now am waiting for the unicorn to appear.
I've been busy with work but have also spent the vast majoity of my freetime watching YouTube build series and researching various topics. I think my level of expertise (well maybe not expertise, but at least technical aptitude) is growing when I find myself critiquing build videos and saying to myself "I wouldn't do
that!" or "
That's gonna be a problem later!"
I've been measuring the few home devices that will come with me on the road with my Kill-o-watt and updating my power plan. I've read a ton of stuff on LifePO4 batteries, maximum SOC, reviews of different battery manufacturers, and pros/cons of 24v vs 48v systems for "high-power" rigs. I think I've figured out why Tesla recommends I only charge my Model S to 80-90% for maximum lifecycle compared to why Victrons' charge controlers do not have a maxmium SOC setting. Keyword - *think* lol.
I've given some thought to weather and extreme temperatures... my desire to travel south for the winter versus what the bus might go through while "stored" for the portions of the year I'm at home - power and battery management, water systems (I've read a lot today just on undercarriage-mounted grey water tanks and freezing considerations). I've thought about future-proofing my intended use as I see it now and what I could possibly maybe someday want to do with the bus in the future. I've read more on insulation and have mostly decided on doing spray-foam walls/ceiling, XPS floorboards, but skipping tropi-cool.
I've read about cellular and internet connectivity (probably too much being I do IT for a living :biggrin

and have come up with my internet plan. This piece will be essential and I'll spend more on this than I'd like but solid internet-connectivity is essential to continue my IT day-job that will allow me to work while travelling. Due to the need to change out roof items like antennaes over time, I don't think that silicone on the roof is a good idea and that a good glossy white paint combined with sufficient interior insulation will get the job done. If of interest to anyone I can write a whole deep-dive on my technology plans later (I may just do it anyway for my own documentation purposes).
I've spent numerous hours understanding the mechanical and power-train systems of my existing party bus fleet and asking my mechanic friend questions about how things work, and why we do certain things like preventitive maintenance on specific components, etc. Questions like why do we use Lucas oil-stabilizer, when we change oil why do we use red ELC coolant instead of the cheaper green, what parts should we just replace up-front on used buses we acquire because we know they'll fail sooner rather than later after 150k+ miles, and what things should I do to the buses to make routine maintenance easier? (2005-2007 DT466e)
FYI - the "immediate" parts replacement list so far includes all filters/fluid changes, low pressure fuel pump, fuel primer, IPR, IPR pig tail, coolant lines (see next paragraph), coolant-line to heater shut-off valves, turbo and CAC duct clamps, and the water pump. We also make the EGR cooler bullet-proof, but that's all I'll say about that

FYI - the easier-maint list includes wireless TPM systems, primary air-tank quick connects for emergency towing, air-tank drain valves with the corded release, and replacing certain fuses with breakers.
FYI - the repairs we immediately budget for are new turbo, new air compressor, 6-pack fuel injector, and UVC gasket replacement.
This list will obviously carry forward to my skoolie.
I recently undertook a project to replace all of our old rubber coolant lines on the fleet (and their cheap junk hose clamps) that kept causing expensive coolant leaks with new silicone hoses (and ridiculously priced $10/ea constant-tension worm-drive clamps). I did this mostly out of frustration this winter, one of my buses had its second coolant hose failure in 3 months and each time dumped about 10 gallons of antifreeze on the ground. At $15/gal that adds up not to mention the customer impact, time to fix, and the headache with fixing road-side in winter conditions.
I've read up on registration challenges. I may have said this before but Iowa has a stupid 5-years continuous registration rule before they'll convert title to RV (even once you meet the 6/8 criteria to be an RV rule. Iowa has a lot of stupid rules - as a commerical for-hire operator I'm familiar with most of them but that's a rant for another day

. Anyway, I am now leaning towards Vermont-method at purchase, run on Vermont plates for 1-year during conversion with "private use of commerical vehicle insurance", before transferring title/tags to Iowa to get full insurance. Still reading, but that's "the plan" for now as opposed to my original plan of "OK Kimmie (Iowa Gov Kim Reynolds)... go ahead and screw me over because I want to do things *the right way*" I'm holding off on having my insurance agent talk to his underwriters to get some specifics as I have them working on a couple other personal insurance policies and don't want to raise too many questions all at once.
One new series I've found intriguing is "adam and steph" on YouTube. I giggle like a pre-pubescent teenager everytime they say "out" with the Canadian accent but I'm intrigued by some of their engineering and the fact that their bus is almost an identical twin of what I'm looking for.
In particular I'm giving some consideration to their "partial" roof change for their shower. As I mentioned in my original post I'm not planning on a usual roof raise for a variety of reasons... my bus will have a 6'4" ceiling (I'm only 5'10"), insurance issues, lack of confidence in my metalworking skills, and my independent DIY nature and lack of friends/family to help me tackle the project. This video though made me think that the roof height at the windows is significantly shorter than 6'4" and the shower is really the only place where I'd need to stand along the side. So I'm strongly considering copying their config in my plans.
I actually gave the handicap bus at Midwest Transit that I had previously eliminated from consideration second glance to see if that might work for me with the new shower-height consideration.
However, upon visual inspection the added height of the handicap door is pretty insignificant and with the other factors that led me to disqualify this bus initially (fuel tank size, rust, overall length) it wasn't enough to change my mind. After reading about insurance and "significant structural modifications" I'm hoping that doing this "shower skylight" and not an overal roof raise will still keep me within the insurance underwriting acceptability list and would be simple enough that with my soon-to-come "beginner/professional amatuer" welding skills that I can pull it off.
I've added some tools to my shop and been practicing some new woodworking skills with pocket screws and different attachments to my circular saw for more square cuts and assemblies on my latest party bus build. Things like accounting for the width of the blade in cuts that any experienced woodworker would roll their eyes at me about I'm figuring out on my own... and with the help of YouTube university
