Want to post an update, to keep the forum alive.
All is fine!
I have put the car together already Oct. 24 but it remained in storage until recently. During last weekend I drove it 200km and everything is just fine. Shifts nicely, clutch engages easily, no slip, no noise, no vibration....
I assume they just changed the design of the flywheel, maybe to fit to some newer Ford products, whatever.