They pretty much just plug right into the JP main body!!! I drilled out the stems on the thrusters & epoxied a bolt in them, so I could thread a big washer with a nut to hold them on from the inside. Rocket: I did'nt do anything with it...just stick it in the hole right before I troop. Been doing that for going on 3 years now & never had a problem. You could give the rocket the same treatment as the thrusters....Ie, drill a hole in the stem & epoxy a bolt in it etc. Of course, I am using an MLC version 1. He may have changed that a bit if you have the MLC2, but looked like its the same set up form the pics I've seen.
D