He's the dumbass in the scenario.
First, he bought a cheap knock-off Ebay lip kit for his 350z which is of terrible quality, and he's bitching about fitment and it being wavy..? Dumbass, of course it's going to be wavy and have shitty fitment, ITS A KNOCK-OFF.
Second, he really thought $750 dollars would be a nice job? Get serious.
Honestly, I feel bad for the car more than the idiot that owns it.. It's a case of buyer beware and obviously he didn't do his research before committing to this, "import shop" that is clearly run by 6 year olds. You get what you pay for and everyone should learn from something like this.
BTW, This body shop amazes me.. were they serious thinking they were going to use wood screws? I don't know how they get any business at all.