Hey Giles Looks like you came prepared but how on earth could you resist opening the boxes?! Great to hear you aim for Centurion - be all you can be Trooper
So...like Greg mentioned, looks like the torso (back/front) can come up more and that would help with the gap you have now and also pushing the back closer to your body and for the plastic digging into the shoulders they might need som shaping/bending (see Tony`s thread) and...hard to tell for sure but it looks like you have your shins reversed, the shorter swoop goes on the inside (to conform to the muscle) easy fix in the tape-stage just swapping the sniper knee
Also...how wide are the ridges on the thighs? Would a 20-22mm cover strip hide them? And finally, wrist end of forearms there can be no return edge for Centurion and as a bonus it`s much more comfortable Overall great progress - keep it up Trooper