Should i make a racing lawnmower or a go cart?

i have a old 18hp engine that i plan on tuning up some on a old lawnmower and im either just going to use the lawnmower frame or im going to weld together my own frame from some pipes and put a roll-over bar and id also probably add a little bed in the back for carrying camping/hunting supplies so what do you think i should make a racing mower or a go cart?

I think you should just sell the engine and buy an ATV.