yeah, it's not yellowing, the plastic comes that color, either way, hope you do enjoy building your reactive armor, I know I did, but it was a pain in a few moments
the instructions (since they are in japanese) aren't too clear for what to built first and stuff, and later when you're attaching the armor, it magicly points for it to attach on some holes on the intake leg part and the nosecone that don't exist, it really pissed me off cause it got me thinking I put on the wrong part and made me search for a while if the piece actually existed
oh yes, and I think there's a piece from those rubery thingy to use as pivots, is labeled wrong on the instructions
and there's a lot of decals that you can use instead of painting, I realized that too late, since I put the decals last and realized a painted a lot of stuff unnecesarily