more done today...
The rear axle has bosses for the servo plate...
So used them to mount an scx10 battery plate. 2 out of 3 holes lined up and also added another:
Finished mocking up a lift system for the implement. It doesn't look scale but it does keeps it straight and steady. Also lifts up nicely past the fulcrum point to relieve stress on the servo while in the up position. Plus the servo can exert down pressure to help the implement dig in more than it would on its own: