I like the fact that GO-Kart kit is easy to assemble because I'm not a mechanic. You need to bolt down the seat to the riding bar with the supplied screws, and then affix the assembled cart to your hoverboard. The two Velcro straps wraps that you loop through the slots near the base of the cart are then wrapped around the hoverboard on each end near the hoverboard tires. When affixing the GO-Kart kit to your hoverboard, try to center the cart evenly between the hoverboard tires.
Wish the small go cart wheel in front was bigger (perhaps the same size as my hoverboard tires, which are 8 inches) so that when riding the go cart you can ride over small bumps. But all go cart accessories I've seen come with the small front wheel, not a larger one.
The manufacturer does supply extra Velcro straps and seat-mounting screws.
Takes a little while getting used to maneuvering your hoverboard as a go cart-- starting and stopping, turning left and right, or going backwards. To me,5 foot, 11" and about 200 lbs, this is a much safer alternative to riding your hoverboard standing upright as a balancing board.
I've tried out the HoverKart several times and have had no problems. I look forward to many years of riding pleasure!