Although more expensive, I keep coming back to using off the shelf parts, or some common salvaged parts, to build an independent mobil platform.
Gas engine, hydraulic pump/motor, tank, valves, maybe hydraulic steering. The SuperSplit bolts to that via bolt holes previously used by the two leg posts.
Seems like it would be a simple system, few moving parts, adaptable to engine on one end/transmission of power to the other with variable speed control, and forward/reverse.
Another reason is that during the build process, the splitter can still be used as is. The mobil base can be tested/trouble shot without tying up the splitter.