this is a finished work and not a wip, so these opinions can probable be disregarded

-the main frame bars look a bit thick, they look slightly too thick and heavy for a go kart.
-what looks like a running board on the side of the kart to aid in stepping into the kart i would remove totoally, getting in awkwardly is half the fun of driving a go kart.
-the battery looks also a bit big for a go kart, the height looks ok, but i would thin it out a bit, it doesnt take much power to turn the lights on.
-the wing looks a bit awkward, its the only thing that doesnt look like it really belongs.

i think thats its for now. it looks like a very comfortable and safe go kart

what is that canister thing beside the seat on the one side?