Thanks for those videos, I learned a couple tricks for future use. Trying to learn seat covers, to do my own because I can't justify the expense of a custom cover. Here's my progress to date (wife was gonna toss the chair due to ugliness!) canvass-like fabric seat and vinyl back.
I understand your desire for a vintage beemer, I hang out at a beemer restoration shop on some Saturdays, it is infectious.
p.s. as a lowly "shop" teacher, I bow down to the special needs folks, they have superhuman powers!