Rye, the radar dome can be left off but then the ship would not be scale. The full size ship has a dome. It comes with the kit, all you have to do is epoxy it on, then bondo it up. Helo is short for helicopter. There is plenty of room inside, the ship is long so your compents can be spaced out. I will have a sound system in mind in a few weeks. The frame up is straight and simple. Just line it up correctly and keep it straight. Not any tougher then any other build.