the most important as follows:
Bottom bracket height: 40cm/16"
Seat height: 20cm/8"
Backrest angle: 40° from horizontal
Min. distance heel to ground: 7,5cm/3"
Car body height at crank position: 75cm/30"
Car body height at knee position 80cm/32"
Maximum height of soft top: 105cm/42"
Wheel base: 210cm/83"
Ground clearance: 12cm/5"
Weight: around 60kg/130lbs (with two drivetrains)
Here are three different versions of my pedal car.
It's basically the same car body with different rear versions, which can be simply attached to the tail.
The Kamm tail
There's still some work to do on the front, which has to be changed.