The photo below, taken at the Vintage Club’s appearance at Mountain Speedway earlier this year, demonstrates how the ATQMRA midgets have been anything but cookie-cutter.
(Click the photo for an enlarged view)
The yellow #26 is a Crosley-powered "upright," a car with the driveline centered in the chassis.
The red #16 is a Triumph-powered rear-engined machine.
The blue #1-X is a Rotax-powered offset roadster.
Each of three of these cars was built to a common set of specifications, but clearly those specifications left plenty of room for innovation!