Thanks Monkey and Dee for your input and ideas....whenever I think I'm finished I post here and you all give me more ideas.....It's been a joy to do....
The hot ticket if you have a dirtbike or other m/c is old bread trucks. Plenty wide and killer headroom to build up when you can't build out ( aka slider) like in an traditional RV. I tried to talk my BIL into doing this instead of buying a camper. He is still in the research stage. If he lived closer, I could weld all his metal for him so he is thinking wood at this phase.