There seems to be several people interested in new weatherstrips. Would be great to have a new production run.
But, the removing and intalling scares me - so please give me some tips about that too.

Jani, do you mean cracking of the chrome trim?
I would guess a rechroming shop would be the place to go. Probably quite expensive though.
Yuo might want to ask Jan Krakevik in Vilnius. He is a Norwegian running a restoration shop there. His team has done jobs on at least three DeTomaso's.
See the pictures: http://www.jancarfactory.com/