So I have actually lived in this bus for the last year. I did some quick framing and bought a catalytic heater, propane stove, hand-pump sink, and a few other necessities and threw together an acceptable living space in time to hit the road in search of some snowboarding fun.
Now I have ripped everything out of the bus again and I'm working on some 3D floor plans using Google SketchUp.
I have a few rough ideas and a few cancelled mistakes I can share here. I figure the more ideas, the better (even bad ones).
The only areas in the floor plan that I am pretty much certain about are the dinette/bed in the back and the shower/toilet in the front. The back of the buss needs to stay as light as possible for good weight distribution. I am now researching metal fabrication and I find it very exciting. I hope to design a light-weight plan that maximizes my space and comfort.
Now here I am on Skoolie.net talking with the pros. So I hope to hear some great ideas from everyone on board
First Design for Dinette/Sleeper:

my original dinette/sleeper design. wooden construction with storage in underframe and seat backs.

tabletop doubles as a platform for sleeper. simply remove the extension pipe.

this second design uses less lumber (i think). instead of framing with 2"x2" i designed this using 1/2" plywood for vertical support. this picture is missing the front face of the seat. the seat has more storage space than design 1 because of the plywood framing.

design 2 has a removable middle seat section and chair back allowing access to the back door. removing these pieces would allow me to use the bus to haul lumber, etc. up to 14' long
So that's what I've put into 3D. Now I want to use the concept to plan for a metal-framed dinette/sleeper. I am planning on using lightweight paneling for faces and some plywood for the seats and backs (which will be hinged to the metal as doors for storage areas). I'd still like the removable middle option seen in design 2.
Any thoughts or advice? I'm getting started now..