Not really big enough for building on, IMHO, but could assemble ARFs on it. I'd like to see a minimum of 3' x 6' and 4' x 8' would be nicer. Room to spread things (including large plans) out and still have a place for parts you are going to use in a particualer step to sit. Much bigger and I think it would be unwieldy. And don't forget to have a heavy vice on those outer tables I mentioned before.

The wall shelves are good.