I'm guessing there's not many marinas around you but if there is, you can ask if they have someone that makes boat covers for them. If so, that person could probably make you a nice cab similar to a bimini cover. The people I know that do it have a truck/trailer and travel from place to place so they could come to your house so you don't have to take your tractor to them. If no marinas, you can check with people that make home or camper awnings.