Harry, Didn't know you were doing this too. Will attach a photo of the shop I just finished. It's the 2nd one of this design and I really like them. I agree with the insulated concrete forms, they really work. Pouring you concrete floor on top of foam sheets also helps a lot. I built my 2nd gambrel roof shop into a bank and I can drive completely around it and trailer things into the upper story given the lay of the land. Don't forget 10' high door (minimum!). I went up 18 course of blocks so the ceiling height is good. Had to put a beam down the center as I wanted to be able to put weight upstairs. They can NEVER be too large and don't forget about how much depth you need to get around the back /front of a boat on a trailer. Mine is 32' deep and it could be deeper. Can sent you the plans I derw up.