Thanks for the help and info!
Small update:
we've completed the front of the car as well, a nice airdam with the front of the undersection closed as well. We've also finalised our camera mirrors, the car looks so much better without those big black mirrors. Tueseday it will get some TLC on the technical side and then we can finally do some proper testing. Keep you updated!
*not visible, but we made the rear panel of the boat tail out of aluminium as well (previously white plastic, see photo on first page) and made the trailer rear lights sunken, so no more blocky structures at the back.