They do indeed, I guess the weapon etc thing is a little personal niggle - after all, most GW orbital/atmospheric vehicles (T'hawk, Marauder etc) have exposed weapons also. Apologies for the slight rant
It could be alot of fuss but, if you can pop the joints and file down the bumps, you could then drill joint and use some rod or such for a good snug fit, main problem is that this'd still wear loose over time.
The problems of post apocolyptic space engineering are never ending! Haha