My dad and I built two backhoe attachments using the backhoe from trenchers. We didn't try to use the cab controls so I won't be of much help. How would you see where you're digging from inside the cab? It would seem that once you got down any depth you would have a hard time knowing what you were doing. In our setup we made handles that extended out of the cab so we could operate the skid steer while setting on the backhoe attachment. Probably not a great idea but that's how we do it. I can't see how you'd get your handles inside the machine to operate the how since you'd have to divert flow from your lift and tilt system to do that wouldn't you? What I mean is you wouldn't be doing functions that are normally controlled by the auxiliary hydraulics at that point. I'm sure there's some legal disclaimer I should copy and paste to this comment