I don't know if it helps people, but a while back
lonepigeon publicly let us know the greeblie in the one port is a cross-shaped knob, originally red, and not the cross shaped BOC cap. I can't remember the thread, there was a tight screenshot he showed us.
I think in the same screenshot there is a piece of the V8 engine as well, it looks like the arm of that FX-7 medical droid. Maybe this will help with dimensions?