Have your interior guy follow the judging guidelines. I've thought a regular sofa upholstery shop would do a better job since the Model A seat material aligns more with an old couch than a modern foam seat.
I'm changing the seat in my Coupe to make more room. I didn't want to ruin my nicely done original seat in case the next owner want's it stock. I bought material from Classtique and now I'm looking for someone local I trust to stitch it up.
https://www.glideengineering.com/