Looks AWESOME! as far as the ZL1 imitation, I wouldn't worry about it. As lonng as don't put ZL1 badges, I don't see why someone would say your trying to pass it odd as a ZL1.
Your just trying to personalize your ride. Same as you would if you were to put an after market body kit. It's just that the GM stuff IMO is much nicer than anything after market. Plus the after market stuff gets dated and go out of style. The GM parts will always be classy.
So stand proud and enjoy your ride