you can always have "sub" rules like I do at the USVTA Nationals in Music City

USGT sponsored by PROTOform
a. tires must have visible tread to pass tech
b. all blinky type esc must be on the ROAR list
c. bodies must have at least 3 numbers
d. must be in some form of race lively
e. must have a front and rear bumper of some sort.
f. use your decals and make it look like a race car including headlights and taillights
g. all rotors can not be larger than 12.5 mm in diameter

or

I.R.O.C. Pro GT Class sponsored by Gravity RC
a. must have TQ'd or finished in the top 5 of one of the following events running U.S.VTA rules: Scale Nats(Chicago) Southern Nats(Nashville) Summit Nats(Ft Wayne) Halloween Classic(Cleveland) Snowbirds Nats(Orlando) U.S.VTA Pavement Nats (FL) or the U.S.VTA National Points Series
b. sponsored or unsponsored
c. limited to 10 racers
d. 6 rounds at 10 min each
e. must use the PROTOform Chevy Camaro Z28 part#1544-30
f. All included decals must be used or sub with paint
more to come