Re: new 1987 thomas built conversion for band tour bus
you should be able to bolt the spare tire under the bus in back of the rear axle.. that might help on space.
And a minivan rear seat could replace the bus seat that is in there, there are a couple of widths of those.
If i were going to use the space that you have across from the cabinet for a both a couple of beds, and for day use, i would build something like a 2x4 or metal framework and have the top bunk swing up to the ceiling during the day, and have storage under the lower bunk bed.
just a couple of thoughts...
Jesus Christ... Conversion in progress.