Yeah, I'll probably get around to doing an RC one at some point. I've made some scale RC aeroplanes in the past - last one I did was a quarter scale Fokker DVII with a four stroke engine - I'm still having nightmares about how long it took to hand paint the lozenge pattern fabric I covered that thing with. And I damn near turned myself into a eunuch once starting it up! But it did look very cool and the bigger ones always fly better.
I guess that's true with subs, I imagine the bigger RC subs look better as far as scale against the waves go, so if I ever did an RC one, I think it would have to be a big mother and not some tiny one, although I bet they are fun too, I have a small RC tiger tank actually, and thats certainly good fun.
Chock