HI Ragnar
Now that is big project, must admit I have no ideas here.
My insurance covered the full restoration of my frosch after a accident.
The rechnung was about 8000,00€ thank god that was paid by the insurance.
Everything was done very professionally and the car was in the workshop from Sept
to Dec that year. Must admit that not having the car for so long was hard but it was worth it.
Good luck and I would not suggest this route to anyone!
JW