Here are the specs as noted by the INEX sanctioning body. Some interesting facts are that there's very little a team can fashion on their own to be INEX-legal. All body parts must be made by INEX, as well as the bumpers. You can choose your own brand of seat. Shocks and springs are strictly regulated.
The engine is at least partially sealed. There is a new power plant on the horizon for INEX, but at this time they rely on a Yamaha motorcycle engine, either 1200 cc (partially sealed) or 1250 (sealed).
The tires are regulated to one brand and style. Treating them is not allowed.
Re the photos, this was from Eric's complete rebuild after a crash last year. This is pretty much what the car looks like right now, as I type this.
From the INEX website here are the specs on Eric’s car:
WHEELBASE
73.00"
OVERALL WIDTH
60.00"
OVERALL LENGTH
10' 6"
HEIGHT
46"
ENGINE
Yamaha fx09 (sealed)
HORSEPOWER
125 HP
WEIGHT
1,250 lbs. with driver
TIRES
205/13R60 Federal Tires 595
WHEELS
Width: 7" / Diameter: 13"
SUSPENSION
Coil Over with Bilstein Shocks
FRAME
Full Tubeframe with Integral Rollcage
HARNESS
G-Force Five-Point