what is the cheapest way to make this?

what is the cheapest way to make a bicycle kart? see me and my mom are very poor "kinda" the money is tight here and i would like to make something cool like this but heres what i have to make one this is ALL i have i dont have anything else meaning this is all the parts and tools i have 1 ten speed mountain bike,1 weed eater "working",2 planks of wood "the legenth of my arm,1 pair of screwdrivers.gasoline "for the engine to run",1 spare bicycle tire,1 spare and rusty bicycle chain,wire plyers,1 hammer,i only have 10 dollars and no im not allowed to get a soldering iron/gun so if theres anything that you know of on how to make this please let me know.

what is the cheapest way to make 2 potato guns before May 20th.