This sounds like a cool idea to me. A few years back, there was a Scenicruiser shell at I-44 bus sales in Saracoxie, MO. (about 150 miles from you). That would make a great candidate for what you are describing. Several years ago I made my son a playhouse from a salvaged Scenic. (See photos.) He's now a teenager and not exactly into the playhouse anymore. I'm considering making room inside my building for it as an office area. Just can't bring myself to get rid of it!
That has to be about the coolest thing I have seen in a long, long time. A bus exiting a shop as an office. What a terrific idea. That looks incredible in the photo.