Shoes are a must. I'm right at the edge. I cannot drive it at all with normal shoes, not only because of the tight space between pedals (I wear US size 13), but the extra height/length from the sole that causes my legs to raise up (almost hitting the steering wheel).
I went on my test drive with my shoes off (socks) because I didn't want to get it dirty. When it pulled off the trailer in my driveway, we jumped in and took off. I felt like I had grown 2" or gained 20 lbs. with sneakers on. I got a pair of driver's shoes and it feels perfect.
I would suggest that the narrower tunnel is of great use when you are wide as well as tall (as I am). I find that on long drives I get fatigued from trying to bend my accelerator leg "around the corner" in a LHD car. The center console seems to bulge out and I put a lot of pressure on it while driving. Someday I will order the narrow one. Strange that this modification for wider backsides comes from Germany and not here in the old U.S. of A.
I cannot imagine that the seat modification would help without using the wheel spacer. All that would do is raise your too-long legs even further.
I will say that, as with any small sports car, the more you use it the easier it gets. I never take my wheel off, and now I can slip in and out easily. The first month was pretty awkward. It takes time for your body to figure out the optimal way to get in and drive.
I feel for anyone who cannot drive this car comfortably. I lost 100lbs. and didn't buy it until I knew I could fit. You can't lose height, but I would suggest doing anything you can to modify it to fit you - If you think you want a M3W, and can make it happen, you won't regret it.
