Just my ideas:

No weight limit.
Track, aprox. 190mm, no 200mm chassis.
Ride height - no dragging bodies or chassis. Usually 4mm will get you high enough if your body is not below the chassis.

If it is the size and shape of a 1/10 sedan, likely it is fine. 2, 4, 6 or 8 wheel drive is allowed, 10 is not, that would be ridiculous!

Open rubber 1/10 sedan tires, Sorex 24 seems to work well and last. Any rim, insert or tire.

Wing height? Whatever the body comes with, I guess, as long as it won't damage the carpet on roll overs and doesn't look retarded. Open street car bodies? No wedges. Sedan or Sports cars I guess.

Battery voltage, whatever you think your ESC can take! Lipo or Nimh. Lipo to be charged no higher than their voltage rating. 2S - 8.4 volts, 3S 12.6 volts, etc.

Open motor, 380, 540 or 1/8 scale, be creative! Must be safe and electric. Sensored, sensorless, inrunner, outrunner all ok. Any number of drive motors is allowed. Any kv, any wind. If you build a system that spins the motor higher that 100,000 RPM you have to wear a dunce cap while racing.

Racers Tip: A car that can do 120 MPH is likely to overheat and/or not be effective at the slow speeds we run.

Any vehicle that looks electrically or mechanically unsafe will not be allow to run. Wild or seemingly uncontrolled driving is not allowed. Repeatedly hitting other cars due to poor driving may disqualify you.

This will be similar to the "Pro Sedan" we ran 6-7 years ago at MARCCA. Pretty much open rubber sedan.

Probably the main rule is common sense, be reasonable, don't build a rocket if you can't drive it.

Mine will probably be a T2 009, 10.5, 2S.