GerryR

The Pfaff 1200 series (1221, 1222, etc.) are domestic machines but are very rugged machines, and some of them have an upper walking foot (I believe it is called the "Matchmaker Foot") that can be engaged or disengaged. If you look on Youtube, there are videos of people using these machines for auto upholstery. I have no experience with Alcantara car upholstery so don't know if these machines are suitable for it, but it may give you another option. Brubaker's in Penn. (https://brubakerssewing.com/) would be someone to talk to as they are a Pfaff dealer.

Very nicely done. I'll have to rethink my approach to maybe simplify it somewhat. Thanks for the pictures!