Sean; In a message dated 98-03-15 12:50:14 EST, you write: << What shape have you chosen for this? >> Actually, it looks a bit like the Aqua-sub, but different, and without 'wings' or the ballast pod. Also, thanks for the web site reference. So, I'll eat some crow. Still, seems to me to be beyond the realm of the home builder, and I'll bet the price tag is wow!