Mark, you should have seen Bryan Hebert's current project. 100% built-up and sheeted. As usual his attention to detail and craftsmanship were second to none. Built-up definitely can work, though. From what I understand of the processes he used, it was very similar to the way composite planes are made, but with a balsa/glass sandwich for the fuse. I can't wait to see his finished product, which from what I understand isn't too far off!