I would suggest using all the same type of fastener for removable bits. Only having to remember one tool is significantly easier than two.
You could glue stiffening ribs onto the last section, since it sees higher aero loads than the front. You might consider trying a shorter spoiler on the back as well. It might be hard to quantify any gains, but a coast-down test can tell you some of it.
Looks good, though!
-soD
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