Worked on the lower half of the car today. As usual, the floor and the diffuser are too thick. I shaved off material to make it slimmer (learning from masters like エヌエフさん). Also, I am going to replace the exhaust pipe with aluminum tubes. You can see the 2 sections in the picture. I have already grinded off the cast on pipe from the base. Still need to cut 2 channels to put the pipes in.
Enough for the evening. To be continued.