extrapilot: yeah sorry about that, please ignoer me i was working off some pictures that i assumed were shots of the SX3 column at superX3.com, it turns out its just one of the large variety of x3 variants.

Personally i would go for a completely optoisolated design. I have previously seen logic in chinese pcbs which runs with its ground level at potentially dangerous voltages, and god knows how the board will behave should it ever fail.