Wittman Tuner - circuit board

[4 Strings]

I realise this should be in a a technical forum, but I hoped a first shout here might reach a wider audience.

Has anyone use, got or have a picture of the circuit that goes with a Wittman Pro onboard tuner?

The guy at Wittman has come back with info when asked in the past, except for just recently, but it's holding up the progress of my custom bass.

The luthier wants to rout the controls chamber but needs to know how much space to allow for the tuner circuit board (it's pretty tight at the moment).

Anybody seen one?

Cheers