Welcome to the world of model submarines. You have one of the very best resources that you could possibly have...right there in the UK. It's Andy, in London, who goes by the avatar of Sub Culture. He is very experienced, rational, logical, and helpful. It would be very much worth your time to contact him, and pay close attention to his advice, which always seems to help make sure that you won't waste time and money by re-inventing the wheel.
Good luck on your new adventure, which will be frustrating, exciting, and ultimately, satisfying.
"The Japanese solders would die for the Emperor, which made them formidable. The U.S. Marines would die for each other, which made them invinceable"...Iwo Jima