That's very nearly what I'm doing, but I don't think I posted any pictures of it yet, so it probably isn't mine you're envisioning. Mine already had a mid-ship door so I simply deleted the front door. Was going to put the generator there where the stairs were, but it's just a little too big to fit comfortably. Also didn't really care for having the generator making noise on the right hand side of the bus because if we're sitting around outside, we'll almost certainly be seated on that side. Instead I'll have a storage bin where the front stairs were, and the generator on drawer slides on the left side of the bus.
Maybe the one you're recalling was one of these:
kimberlink in 2012
RazorCityDen in 2009
There are lots of references to one done by sportyrick, but I haven't been able to find any source material. I'm guessing it was done around 2009 but the photo albums only go back to 2014 now..?