Got the MikeD holo mod working. Assume there's something wrong with the power / logic board thingy, as the Pi works fine with a mobile phone charger.
I'll likely be selling the kit though and waiting to see what Rappelbox comes up with. The delay and lack of responsiveness when outputting media to the screen ruins it for me. I was a bit sceptical over it after seeing video, but the beautiful restored machine I bought already had it.