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BTW, Jedi, you're doing a fine job of this project. Coupla thoughts:
1. To smooth air over that gap for the exhaust pipe, why not consider aluminum window screen, held tight? Lets heat out, alu. screen is a superb heat conductor, so dissipates hot spots.
2. Control arms move up and down, and make drag hanging in the breeze. Since Coroplast is flexible, would it work to tie panels of it to the control arms, that move up and down with the control arms? Such panels could be fixed at their forward (upwind) positions, and their trailing edges be tied to the control arms. Perhaps elastic ties could be used, to stretch a bit as the control arm/Coro fairing move up and down. This would make almost all of the car's underbelly smooth and flat. Properly done, Coro gaps could act as engine heat vents, drawing hot air out of the engine bay by Bernoulli effect, for less cooling drag.
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