Nice work Novice. I've always liked the look of the I-351 class, like a Type IX on steriods, certainly they might have made excellent long-range subs had they been used properly.
Excellent sub, nice shading and detailing. This is still one of the most interesting threads, even small navies had interesting ships and good looking vessels.
What a cool idea. Actually I think anything with a bubble canopy tends to become much sleeker and doubtless it would have increased the speed of the Hellcat by a small margin too thanks to the reduced drag. The only thing it might need is more tail area to compensate.