Started this a while ago and got motivated recently to finish it up. Basically, I hate the lower body of the Onslaught mold, especially in combiner mode; I can't stand the stock transformation, but in fan mode, the legs (thighs particularly) and hips are floppy and off proportion, but I didn't want to buy yet another aftermarket kit (TDW) to make them more appropriate. Since the Motormaster mold generally sucks and I have several of them laying around from past holiday clearance sales, I basically pulled the lower half of a Motormaster fodder body (from the lower ab/hinge section down) and stuck it inside a dremeled out Onslaught. Doing this gives Onslaught/Bruticus a waist swivel, and also improves the look a TON (in my opinion) by beefing up his legs from the thighs down. Articulation is also vastly improved (provided that you had a tightened up Motormaster to begin with). He still maintains his alt mode decently as well. All that's left now is to paint up everything properly and clean up the dremeled areas at Onslaught's crotch. With my POTP Blast Off on the way, this guy will probably take over my default Bruticus position from my Unite Warriors version; he just looks tougher now and is more fun to play with. =) Updated with some paint. Ended up not buying quite the right spray paint for the legs, but close enough for now.