What about taking something like this:http://www.kirkeyracing.com
Well, I'm going for something that looks a little less out of place. Not quite going for the post-apocalyptic, dirt track, rural Nascar fan aesthetic.
I'm somewhere between the size of a WW2 Japanese infantry soldier and the modern, morbidly obese American. Drop me in Tokyo station and I tower over all the salrymen while I apologize for stepping on them.
I used to be considered tall over here. But in the last two decades, six-foot-two grade schoolers are everywhere. And those scary 200 pound kindergarteners... But I'm not one of those that can't fit behind the steering wheel of anything but a minivan.
So, I'm not skinny(despite my better exercise efforts), and not too fat.
However I went shopping for racing seats a number of years ago, tried to sit in a Recaro fiberglass bucket, and discovered that they had designed the seat for a tiny, little Italian man, because my body was wedged between the side bolsters and more than two inches from touching the flat surface of the bottom of the seat.
So, yes, even us formerly average sized, not quite in perfect shape persons of European descent are in trouble fitting into stuff designed for WW2 Asian veterans. As I shovel the rotted and decayed remnants of the bucket seats out of my 60's car, I look at the tiny little people pictured in the advertisements, and wonder just how the heck a westerner is supposed to fit.