I was thinking about building a frame fer the rear pan but now that I have the majority of the belly pan supported and the cross members in, I should be able to fasten/attach 2 sheets of 4mm coroplast together with the correct slope and make it frameless.
I will still have to put a strip of aluminum flashing as a heat shield on the rear pan though...
This should make the rear pan as lightweight as possible and I should be able to attach with some simple pins at the front and rear attachment points. This will allow me to easily remove it to git to my spare tire when I need to...
Awesome! This is really a great thread and a great build. I'm looking forward to hearing some new numbers on you MPG gains!
Also, raising that rear section higher than the middle section should be providing you with SOME net downforce. I wonder what impact the angle of that last section might eventually have on FE. I guess I'd angle it to how much load was in the back... Angled up higher with greater down force for an empty truck, maybe flat across for hauling a load? (or even lower for increased lift?)
I look at this thread everyday. Very impressed. Keep it up!