I plan to build a go build a go kart using a kohler K series engine for a cub cadet 128. If anyone know anything about seting up these enginges please PM me because I need help setting this engine up. What material would you recomend to build he frame? I want to use square tube because it would be easier to work with (no notching). I was thinking 1.5" X 1.5" with a 1/8" wall. Will this work or am I over enginering again? The kart will be driven heavily off road.