I see a lot of people use a dremel tool to dig out a trench so they can run a wire. Even as small as magnet wire is you will still need to putty and sand the trench you just made and if you're like me, it's never going to look perfect like before the trench was ground out.
Instead use electrically conductive tape. You can get copper tape used for guitars OR if you don't want to spend money on shipping you can use metal foil tape that you can get at any Lowes or Home Depot.
Run the tape inside the parts that don't have room for a wire. It is thin enough that even pieces that fit flat together can usually still go together with no issues. For something like the Enterprise D nacelles where the support pylons are one piece and there is no way to get inside, you can just run the tape on the outside. Use a tool to get the tape down in the details on the model (I use a wood skewer) and on the ends leave some sticking out and fold it over on itself. Then make a small hole in the tape to solder your wire to. You can prime the tape (self etching primer is recommended) and not lose the electrical property of the metal tape that is under the primer and paint.
Don't forget you will need to run two lines (busses) one for ground and one for your positive voltage. This should make people's lives a lot easier when it comes to running wires to places that normally don't have enough room for conventional wires.
I may be new to building lighted models, but I was trained in electronics and engineering
