My first RC excavator was a 1:32 scale ROS Hitachi Zaxis 210 and the RC Hitachi was one of the most difficult builds I have done so far due to the many moving parts and the weights involved.

I wouldn’t advise you attempt this unless you were very confident and not too worried about breaking a few parts before you get it right. If you want to build an RC excavator I would suggest starting with a plastic New Ray New Holland E215B. I intend to get one at some point to see how easy that is, I suspect the plastic arm will be much easier due to the considerably lower weight.

That said, the ROS model has great detail so even if you just done the track control it would be a nice addition to your RC fleet.