thank you all, i was especially hoping for tips from aerohead. i think i will go for the polyester edges.
i thought long about giving it an airbrake, and maybe i will but not with these flaps. as i believe that if these are used to brake a 2 ton vehicle, that it will make the whole thing disintegrate.
i searched a bit but i could only find some actuators on some auction sites wich go from 26 to 160 €. i will leave that for the last and keep searching for a good find.
also does anyone know if some sort of spoiler would help? i was thinking of some kind of horizontal wing above the rear end. or is it better to let the cap end with a horizontal part that is in the shape of the cap like most car truncs or roofs end with.
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