Background
1st Device: the "Nuclear Trigger"
It featured a status panel with operational LED lighting effects, a nifty circuitry access cover (that was spring loaded to detach when pressed inward), and an operational LED countdown timer.
Gone however, was the existing the LED countdown timer and circuitry access cover. The former was replaced with a custom built, simulated, alphanumeric display. This new display continuously flashed the caption "STANDBY".
The original circuitry access cover was replaced by a new version made from clear acrylic to make the interesting contents visible. Later, the Prop Department would add some custom graphics to a couple of circuit components. This was apparently relevant to some story element.
Significantly, there would be two new components mounted onto the left of the main assembly. The first (depicted below) was a cast aluminum bath tub drain wrench, that integrated nicely with the existing design
To add texture, a short piece of dishwasher drain house was fitted over the shaft of the wrench. The finishing touch, would be another complex aluminum component that would fit around the former (more on that later).
2nd Device: the "Nuclear Bomb"
Omitted however, was an usable patch panel component, as well as its original case. This process was conducted with some care, as everything would have to be restored to its original condition prior to being returned to the rental house.
The Design Process
Depicted below, was the approved version. Upon approval, a frame component and bomb cradle could be designed and built. The control panel (jury-rigged into position in the photo) would require that a suitable housing be designed and built to allow the desired placement.
It was the prop "Alien Propulsion Unit" he had built for the TV series X-FILES... a show Ken had been Prop Master on for the entire run. Needless to say, special care was taken to ensure that this precious item would be returned in good condition, once the "nuke" had been wrapped (see below).
Construction Process
These were made via a water-jet cutter. In each corner, there was a 1/2" diameter hole. These would later engage tapered pins being installed onto the top corners of the transport cart. This would essentially "lock" the frame to the cart.