Thanks guys!
Ok, back on topic...
Got a little prep work done for mounting the Invaders to the cab. First I had to make a template in Visio. This template will be used to install the hardware onto the Invaders and also be used as a drilling template for the cab.

After months of thinking about how I wanted to mount these things, I decided to use a combination of machine screws, spacers, and weld nuts. The template was necessary in order to get the weld nuts installed in the same places on each Invader, to make sure the holes could be drilled properly in the cab, so the Invaders would be mounted straight. I went with 1/4-20 hardware. The base of the weld nuts are 3/4" and are about 5/16" high. The length of spacers to be used has yet to be determined, but probably in the 1/2" to 3/4" range. The "MAME" in the marquee will also be mounted in a similar fashion as the Invaders.
An Invader with the template on, ready for weld nut installation.

All the Invaders with the weld nuts installed and drying (JB Weld).

Hopefully will be able to tackle the LEDs on these bad boys by Monday.