Oh yeah I forgot to mention, the model comes with its ballast tank already assembled, and it's pretty much the same for the rest of the boat, all you need to do is pop in the servos, add a receiver, batteries, fill in the gas and off you go (pretty much no scratchbuilding involved!). I don't remember if you still need to trim the boat before putting her to sea but I'm sure that with so many features already done for you, this take a lot of things off your hands for a start!

Happy sailing and submarining!