Have to say, i do love this pack, i have had some musings though. With the RCS module, have you though about having the main body set up as a fuel tank and then have the nozzles separate as an individual piece which you then mount on the side with the symmetry (x4), also as a consideration with the 5X1 adaptor an inverted one would allow it's use for intermediate stages as you could couple it to the bottom of decouplers. but anyway, enough gibbering from me, this is an excellent pack.