I played around a bit this weekend with some layouts, and threw them into some 3d modeling software..

This is the 30x40 layout, the model doesn't show the roof pitch on the 30' side, hence why the 12x12 door is the same height as the roof. The other door is 10x10 and will be used for smaller projects such as lawn mowers, small cars, ect.

To show scale I put a 70's F100 on that side and a 2010 F350 Crew Cab on the other side.

I still have to find room for a little bathroom..