Not much progress today, but working on modifying the stock undertrays to mate up with the splitter. I will use these as templates for sheet aluminum pieces (or, comedy option: carbon fibre). Next up on the front end is mocking up the airflow routing to the radiators in such a way that I maintain a fairly large pocket of air on top of the splitter for generating the downforces.
Downforces. Anybody good with CFD and interested in helping me simulate a couple of designs?
I have the diffuser parts sitting on the ground under the back of the car and will probably start looking at that soon too.