Yes I did change the lens to 16mm (bought it off amazon).
https://amzn.com/B006SX31AY The EJ230 is one of the TWO cameras most widely used for DIY. (got mine off ebay for $90
The entire mount can be found here :
https://amzn.com/B005OKQ6FY The battery pack:
https://amzn.com/B00MHNQIR2 The DVR I bought off Ebay.
The cords I cut, shortened, resoldered and wrapped in wire loom & shrink wrapped the ends.
I used a piece of PVC to cover the camera….(PVC cap that I shaped a little more on the lathe). All the PVC parts ended up sprayed w/ black truck bed liner.
I have a few of these lights I use (I don't use my surefire's on air rifles):
https://amzn.com/B00OK85KGM And bought one of these drop-ins to convert it to IR:
https://amzn.com/B009GT1JT2 You can probably source a IR light for cheaper.....but I already had a few of those 502b lights so a drop-in made sense in my case.
I did have to remove the IR filter off the chip (not that big of a deal....just be precise and make sure because you don't want to scratch the chip).
Sent you a PM with a little more info (hope some of this helps).
-Mike