Looks sweet and at a substantial savings. Like another guy said thanks for sharing looks like I gonna buy a new rear spoiler for my Isf lol. As far as the gaps go I wonder if heating up and weighting down might heal the issue.

 

Same gap than BlckGhst for me, but I've filled it with black silicone, it's very less noticeable now. Done that all around it, except on the bottom to have a best finish. Done the same for Tom's rep diffuser's gaps, very happy with the result

 

I need to do that with mine as the the heaviest duty 3M double side tape still doesn't hold it down. Looks good though.