Here's a car with the same chassis as mine with the aerodynamic template overlain.
Some "progress"
https://ibb.co/3Mw5N1r
https://ibb.co/54wNkwR
Feel free to correct me if I set it up wrong.
I built a decklid extension last night. I Was thinking 4 sided box cavity/ psuedo boat tail, but as with most things in life, I may have dove in too soon.
I read a few threads last night whilst half asleep and now feel as if I can actually do something worthwhile now.
The decklid extension stays for now. I'm going to try my hand at rear partial belly pan and get my front air dam sorted.
I removed the rear bumper for a trailer hitch receiver, I may just leave it off. I'm thinking of routing my exhaust between the hitch and body, separate from the under body air.
In my mind I'm building a small diffuser for the bottom side of the pseudo boat tail and the exhaust will vent inside the box.
What I am worried about is poisonous diesel exhaust making its way back into the cabin. Do I need additional air introduced at the same plane? Maybe route the radiator air between the floor pans and under tray?