I have two version of the OnStep Smart Hand Controller PCB, the first version contains a single RJ12 connector for the basic functionality. The second PCB includes the extra RJ12 to allow addition ST4 functionality.

The first version's PCB and matching enclosure, have tested and turned out perfect pretty decent. The second version, while complete, has not been tested and the second enclosure has not been completed yet..

I intend to include an enclosure for the original hand controller PCB and will try to reduce the profile as much as possible just as soon as I get some free time...