Well. If anyone wants to PM me with their email address I will send you what I have been freely given. But I am a newb at this. There is no way I can manufacture multiple hulls. I have these plans, the 144th scale Revell kit and Steve Neill's "RC Submarines for Dumb Asses". With this I am pretty sure I can make one Type XXI in 72nd scale. But I don't know how long it will take me. I am working on Jules Vernes' NAUTILUS this week. I will going plank-on-frame or thereabouts with her. I will save the lost foam method for the U-boat's more complex hull.
BTW, does anyone remember who built that +10-foot long XXI I saw in the SCR years ago when I first joined???