What would the upper floor of the shop be used for? it looks nice but i dont know how old you are but going up steps carrying stuff is never fun but just an idea.
if you are getting or already have the paint ask your body guy if you can use his shop. i have a guy here local that will let me use his if i am only going to be an hour or so on little stuff like that as long as you take your bigger paying jobs to him i would doubt he would have a problem with...