MHZ scorpion on an MHZ leg would be bad a$$. If you go gas, go with the Lawless Cutthroat G-drive. Fred Howe has been incredibly helpful to me and makes the best drives available. You'll want a powerful servo, at least 1,000 inch OZ of torque. Get Promodeler servos, they are the best ones made and get a gearbox for it. Beautiful looking boat BTW