By accessories, do you mean the bumper-weapon + exhauste pipe missile??? Those parts are integral to the mold's alt-mode.
I've only got the CHMS KO of Skywarp, and I must say I was very impressed by the way all the joints hold up (less impressed with the paint-aps on his face). Compared to my Generations Thrust, which has a 1mm mal-formed piece of plastic that very effectively stopped him from transformation into robot mode. The cavity under the cockpit was not able to enclose on the inner-joint. I had to disassemble the chest and it took AGES sanding down 1mm worth of plastic on a relatively flat surface. He can transform, but its a little tight when getting that cockpit over the inner-joint.