Thanks Dan!
Very nice building. I like the 14x16 size, but I cannot build that high because the local building code limits the total height of the buidling to 16'. So I cannot have such a big loft.
I would be willing to buy a plan that fits my needs. The 10x14 mentioned above has plans available for $55, and I may go with it unless I find something better. The timbers for the 10x14 can all be bought at Lowe's. Plus, the 10x14 frame looks like it would expand to 12x16 in a straightforward manner. And the 7' walls ought to work for 8' walls as well. But I might be missing something.
Dan, all you guys are an inspiration to me. I greatly appreciate your help.