I only know one thing for sure about that kart, it's ready to build some fun fairly cheap. It's as basic as it gets, rigid frame, one-wheel drive, 2 scrub brakes (very retro cool), motor mounting plate for straight chain drive.
All you need is a cheap Predator 212cc engine from Harbor Freight, 2 spindles, 2 front rims (with bearings) and tires, 2 pedals with cables and/or rods, a seat, and a piece of chain.
Keep it simple and cheap, and you'll really have something, probably even get your money back on resale.
Do spend $5 for a can of spray paint, help the resale.