Making my own interior. 76 Midget

Today I got a heck of a deal on a surplus roll of dark grey automotive vinyl upholstery. I plan to make my own seat covers and int. panels. I'm going to use the old seat covers and panels for patterns. I want the seats to look more like the earlier ones with the pleats(?) and contrasting piping. Although I haven't told her yet, my mother will be doing most of the sewing
. She has the heavy old black Singer machine that should work nicely. Has anyone else made their own interior. How did they turn out? Any tricks? Thanks
