Nice lookin bus!! Welcome to the insanity
Check out Smittys site when you get a chance, some good demo stuff there. Also, don't even consider using osb as a floor or subfloor. (hard lesson) don't care what they say at home depo, it shrinks and swells with whether and humidity changes.
Also, if you back over a short fencepost, your tire will go flat quickly! (Another hard lesson