[Darrin Wright]

Hi Alex,
I see your point and understand your pain

Each BGC was different, depending on what the manufacturer sourced at the time.
I have noticed different ways of routing the conduit and the use of different fittings to achieve the same result or bend.

Most of the conduit was 3/4", there was a section behind the baulkhead (between start solenoid and regulator/upper elbow before going into front compartment) that was 1" This was to accomodate the additional wire(s) for the change between volt & amp gauges.

UNF thread fittings.
Conduit was installed/delivered in black, then may have been repainted green with the rest of the vehcile.

Some BGC had 1 or 2 conduits going into the dash area (front & rear conduit).
Some BGC had a 1" conduit running from centre baulkhead to elbow or Tee piece to dash.Next to the drivers R arm.
There was a minor different in how manufacturers routed the conduit to the rear taillights and how & when the conduit split between lights.

My suggestion would be (and I assume you have no conduit to copy) to make it up and route it from other examples. Just need to ensure they are correct, I have noticed a restored example very close to me in a gov museum has utilised plastic PVC elec conduit.....