I put together a video installing the front lip, side skirt, and rear apron replica of the BRZ series blue. This was super easy to install, and all together it cost me $270 (excluding additional fasteners and double sided tape)
Here's the video:
I also bought these fasteners from Home Depot to help secure the front lip. I didn't want to rely completely on the self tapping screws:
https://www.homedepot.com/p/Everbilt...4388/204225872
I used 1/4-20 hex head bolts and some washers with those expansion nuts.
Let me know what you think!