Hello, I would like to start building a simple DC motor Go-kart, but I would like to build my own DC motor for it. A simple one that can make the car move. I know how DC motors work and I understand the physics of it, but i'm not sure about some things: - Are all DC motors (large or small) the same (same mechanism and parts like the magnets, commutator, etc.) and are they built the same way? - How much wattage, voltage, force is needed to make the Go-kart move (with me in it)? Thank you.