Tobi do you have any tips for bending plastic sheet?
Keith 
Hello... I use 2 different types of sheet for curved shapes, 0.5mm and 1mm. Bending the thin sheet is easy, you just have to be careful not to produce kinks. I usually build a skeleton first and bend the sheet around it, like here:

Then I put a second layer of 0.5mm on top, which is usually smoother than the first one and stabilzes it.
Bending 1mm can work nicely on some shapes when you CAREFULLY heat the sheet under a lamp or use a hairdryer. (Lighters don't work, they are to hot on a too small area)
With 1mm I always use superglue to keep it in position quickly, the thinner sheet can be fixed with normal plastic glue.
...this is the new rough version of the Romfell.

Camera still broken hab to use the phone...
Tobi