It took almost 3 weeks time, a couple 3-4 hour days. Adding bondo, sanding, bondo, sanding, etc. I had to rotate the side bits inwards and recut their inside edge to help close the gap at the top of the spoiler. That opened up a hole in the fiberglass, so I filled it with spray foam, then bondo'd overtop. To finish, 5 layers of primer black paint.
Next up I'm really feeling the need to get a new airdam and front suspension. I'll have to cut the fenders to make the wheel wells larger going in the front.