Here is my latest creation, one of a few Go-Karts I built with EMT conduit and Maker Pipe Connectors.
This Red Kart is a simplified version to make assembly of kart easy and cost effective.
It is comprised of 3 10ft sections of EMT tubing, (12)Ts, (5) 180s, (5) Swivel MP connectors, about $130 for the frame structure.
There is a bit of customization and welding given that this build, as my previous ones uses repurposed hover board motor/wheels.
I have a full set of build videos on my You Tube channel under MIA Micro-FLIGHT "MIA Hover-Kart.