I'm no help with suggestions. I just wanna say......you lucky dawg!!!!! I so want to go rat hunting with a NV/ scope cam rig. I really want the NiteSite Viper ;-)
I built something similar to that from parts (5" monitor, CCTV camera and a battery). The issue I had with it, was it was so top heavy I had a hard time with it. That's why I eventually went to this. It's extremely light weight. I've also ordered a custom T20 light from the UK (Ian Sirrell) who was extremely helpful.