Continued assembling the wiring harness for the annunciator panel:

1. Soldered all 14 wires to the backs of the LED lamp assemblies, Had some major issues with the lamp leads becoming internally detached from the dropping resistors inside the housings, due to the brief heat of the soldering iron. After trashing two lamp assemblies, I figured out how to solder the connections without applying any vertical pressure to the leads. Got all nine LEDs soldered successfully, and put heat-shrink on all the power connections. Tested all nine lamps. Coated all exposed ground leads with liquid tape.
2. Labeled and prepped all wires for crimp pins. Began shaping them into a tight harness.
3. Modified panel housing to accept the thickness of the harness.
4. Began feeding the harness through the back of the housing, and discovered that the backplates of the LED shell assemblies don't have much structural strength -- or rather that they are simply press-fit into place. If you apply a bit of sideways pressure, the backplates can just pop off. Devised a two-part plan to secure the LED shells. First, I used CA glue on the seams. After it dried, I coated the entire shells with more liquid tape. I will let everything dry overnight and reassess the situation.

All in all, I do not recommend using these types of LED assemblies, and I probably won't use them again. (In the end , they are going to work just fine as annunciators once they are installed, but the struggles to get them to work in this application are just not worth it.)