No More Baths

I'm trying to make a HUGE Nuke on Xbox One and I'm attaching a bunch of rockets onto the base rocket in the middle, but everytime I try to go to the launch pad to try to take off all the parts start flying EVERYWHERE while staying attached, and they're basically no clipping through my ship and I can't take off because when I start the engine all of the parts That are flying everywhere start and my ship spontaneously combusts into a huge explosion. Please help!