Here is a pdf with plans for a go-kart.
The dimensions are 1’9″ by 4’10”. Our engine is 15.4 x 4.6 inches.
Our metal sheet that we built will be able to support our engine, a seat, and our motors. We will also install a steering wheel.
https://kartfab.com/wp-content/uploads/2016/10/Free-Go-Kart-Plans.pdf