Well, part of it at least. Today I soldered up one of the new remote LCD boards and powered it on:
When completed the LCD board flips over and mounts on the back under the LCD; it is exactly the same size. But here I have it bridged using a proto-board, with the Service and ICSP ports connected and supplying +5v.
When I get in the revised controller boards will proof out the CAT-5 cable buffers as well.
BTW, the message "We are Alive!!!" is what the Arduino sketch for this remote LCD / keyboard module displays upon power up. In use it would very quickly be overwritten by the start-up messages from the controller. But at least this gives a quick way to check things are working locally.