Work on the light is done.
I opted to place the connection points at the back of the carriage. I can hide wiring more readily because of the rear doors and curtains.
Some things I can note:
1. The Led color is a sort of lime green. It is an odd color for an odd build.
2. I was pleased at how easily the copper tape takes to solder. It worked like a charm.
3. I cut grooves for the wiring to help recess them. I can't have a raised profile, or the roof and ceiling won't lay flat. In a few areas I had to remove some material under the roof for this goal. They are hidden by the ceiling piece though.
4. I tested the Led within the carriage and I doubt it will backlight the EM guns. The Led is not a high intensity sort. Maybe in a completely dark environment it could. Either way, it's not a deal breaker. That was not my goal; it would have been a plus. The main purpose for the light is to drop a spotlight on the gold bars I'll have stacked below it. And for that purpose, I think it will be perfect. It drops a nice circle of light on the carriage floor. I'd like to have shown you an image of it, but I'd need 4 hands to accomplish that.
I made the Led base out of the same stock I used for the ceiling. I lowered its profile some though, through sanding.
The mechanicals are for the most part done. I can move towards painting the assembly.
One other thing. Once when I have the assembly painted, I will attempt to fashion a cage for the lamp, sort of like below.
End of update