RE: CMP Hellcat
Look back in the thread Luke had shown how he did the sliding canopy. I did it on mine and it was very easy mod to do.
As far as parts from Luke I would guess that is a no. From my experiance he does a run and then that is it. Keep an eye out if he pops up with parts act quickly and buy extras of important things like the canopy. That is what I did and glad I did.