Thanx everybody for the positive comments...
I'm just back from my workshop and did the first measurements on the Sierra... tomorrow, I will put the Escort on the jig and continue the measurements... I think, that during the week I will decide where to place the cuttings on both shells...
@RST Appie: The car will get TÜV... alle important steps especially the welding is under survey of an engineer
@blacky: I'm quite sure to keep the Sierra track... I don't need to shorten anything, as I will put on some rims which will fit perfectly to the arches.