Some very good information and photos in this thread. I’d like to add a few comments; as a Nighthawk CE in Nam; I can tell you that there really was not a one size fits all. For instance, because this was a non-standard system the components differed between units. In my unit we used a 50,000 watt Xenon searchlight from a M60 tank. We never did have a Starlight Scope, although I know many units had one. We relied on the high bird which carried the XM-19 Dispenser, Flare that dropped the Parachute aircraft flares for most of the over-watch illum. The light was mounted using the M23 standard M60 gun door mount. That was in the right side gunners well (rear). Next to the light was the M-134 minigun using a floor mount. On the left side was the M2 50cal and a free M60. Again the 50cal used the M23 standard door gun mount. The selection of having the light and mini on the left or right was a unit by unit decision. The sheetmetal shop and electricians made all the attachment hardware and mounts, there was not a Nighthawk standard kit.
We only had the UH-1D, I did not get a UH-1H until after Vietnam in 1975. The larger engine from T-53-L-11 to T53-L13 (the AH-1 engine) was a blessing.