Hello Bob,
I own a 3000, so I'm not sure how far back the seat can go in a 100, before the back of the seat will be stopped by the rear side panel. In the 3000, there's the limit of travel.
Like others have said, you can change out the steering wheel to a smaller period correct wheel, like a Mota-Lita, which is 15". Or modify your banjo to any size you want. Have some work done on the seat cushion so that it is as low as you can go and still be comfortable in it. Those two things will help you get in and out and have more distance between the top of your leg and the steering wheel.
You can adjust all three pedals, side to side and bring them closer to the front of the car for longer legs. But it will require some creative modifying and some time spent on the project.
As an example, here's what I did to move my break pedal to the left, for it was too close to my gas pedal. The actual metal break pedal pad is held in place by two bolts on the back of the pad. Remove those bolts and the pad will come off. You'll notice that the back of the pad has two metal pieces extending out, that make the slot for the break arm to fit in. I filled that slot with a piece of aluminum. I put the pad back on with the right side of the brake pad now lined up to the left side of the break arm. The two bolts will go through the holes and keep it in place and the aluminum spacer in the pad keeps the bolts solid through the pad. The pad will still overhangs the pedal arm a little on the right, but not as much as it used too. So it still looks stock, unless you're looking to see if it has been moved. Makes sence? Same can be done to the clutch.
The brake pedal arm is adjustable for in and out travel, at the cylinder. The other pedals will require some mods to the arm.
All things can be modified with some time and effort.
I always strive to make my mods, not noticeable. Or as close to not-noticeable as possible.
I'm sure others will chime in with there ideas. Greg, Lin, we're waiting...
Cheers,
Roger