hello Meechinman.
On my Vliestromn model I needed two sets of mast lights as in real life, but at our scale the wires needed would be very obvious so I run two brass rods up the mast (before spraying) one for each circuit, using a brass tube/rod down the centre this is isolated and used as the commom, this way the only wires needed were soldered from the actual bulb to the required circuit. providing you keep everything separated by an insulating material, ie; plastic the system works quiet well, and there is ultimately only three actual connection points which can be hidden discretely deep in the model, when sprayed they then blend in with the rest of the mast.
good luck with your project.