i have an old riding lawn mower i plan on using the motor and wheels and other parts. what is an easy way to build a frame and axel without a welder i would like to use metal not wood. any ideas or tips for building please let me know. if you have specific plans to build a go kart please send the link how would i make a lawnmower engine work to drive back wheels. could i just have a one wheel drive or would i need both wheels on a spinning axel