I could build an off roader with simple body work to keep the mud out. It could be an off road buggy with only one seat, or more of a trials motor with two seats. However these types of vehicle are only meant to be used off road and are not road legal.
This off roader uses a Range Rover chassis and V8 petrol engine, but it has Jeep renegade axles and Volvo suspension. I did not recognise what the power steering was off, but it was not from the Range Rover. It performed well enough when it was moving, it however did have a dodgy clutch / gearbox and at one point it overheated after one of the belts came off.
This very nice four wheel drive buggy has 2 seats. Comp Safari motor? Long Ranger is actually the name of the extended (156") Range Rover Hi-Capacity pickup that towed the trailer the buggy arrived on.
These have two seats and I believe are used for trials.
Off Road Racers
Other Donor Vehicles