From the look of the video (and the sound!) I'm assuming these are based on the 'Legends' series?
Space frame, about 50% size powered by a big bike engine.
The Australia series runs a spec frame and (initially) a 1200 Yamaha power pack.
Outstanding race series with grids of up to 40 cars, usually racing three abreast at most of our circuits and four abreast on the wide ones!
The first few years the American sourced body shells were used but they were quickly replaced by local models, today they're mostly based on Supercar shells, cartoon versions of course.
I had the dubious privilege of a 'demo' drive through my youngest brother's Yamaha connections, at Philip Island of course.
Really good fun if one just drove round at a comfortable speed, really really hard if one pushed the envelope.
I (just me, myself) would like to see them run as open wheelers with the old USAC 'Midget' or 'Sprint Car' shells!!!!!!
After all, what we have is a single seat front engined space frame car with a low weight and high power output ................................... never happen of course, CAMS would go Bat**** crazy!