Making Wheelbarrow Gas Powered

I used the materials I had in the workshop to build the wheelbarrow. I bought a used hydrostatic gearbox and a motor, the steering axle is removed from a damaged wheelchair. The transmission comes from lawn mower tractor, and in my opinion it is the best base for building such a vehicle, it does not need a clutch, has a differential and a brake, everything results in much simpler construction. The engine also comes from a smaller mower only, it is a model honda gxv 140, it is sufficient to drive wheelbarrows, it does not lack power in different conditions. The construction was not without the problems and mistakes I made. The biggest mistake was the permanent welding of the steering axle, which made it completely impossible to drive on uneven terrain, every hole into which the rear wheel fell caused the front wheel to break away from the ground, because the box has a differential wheelbarrow stopped driving, I corrected the mistake by screwing the steering axle to the rear wheel hub from the Ford mondeo as yo