Ok, I have internal pictures up, and am now fielding questions about it.
Given the nature of the two guns, (one opens with the internals on one side, and one on the other.), it's very finiky to put together. The internals are all aligned so that they are on the same side as the nightfinder as it hold the majority of the parts. With out further adieu.... Dysnomia, spirit of lawlessness, daughter of Eris, goddess of chaos.
This is a shot of the all the internals, minus the muzzle and dart tooth, as they are on the other half of the shell. You can see the extended plunger tube, and the re-purposed barrel/ breech.

It's blurry, but you can sort of see how the breech was re-purposed. I cut off the original breech/ barrel, and some of the wider part of the inside, just behind the o-ring. Those were bonded together, and then I added a larger o-ring, and some e-tape. It makes a perfect seal, and it's easy to lube. All in all, not the *optimal* solution, but a solution none the less.

Here is an image of the extended plunger tube. To do this, I stuffed a large spring into the two halves, so they were flush and then used a solvent adhesive. When it dried, I epoxied on the outside of the tube. Through all of this, there were multiple checks to make sure that the transition area was as seamless as possible. Again, it works quite well.

The bolt sled does need to be cut in order to accommodate the lack of the back half of the Recon. It's a simple cut really.

To elminate dead space, the plunger head sits flush with the end of the tube, and when inserted, the end of the barrel/ breech. It does this by means of a longer spring. It has, I want to say, about half of an ar-15 spring in it, but I got the spring pre-cut from a friend, so it may be closer to 1/3 or even 1/4.

All of the gray stuff seen in the pictures is Bondo. That stuff is amazing, and thanks to FA_24 for the inspiration to use it. Also, this whole endevor took a considerable amount of time and energy. To fuel it all, you'll need something like....

(no idea where the hell we got that stuff, it tastes like skittles....)
So, that's it. Questions? Comments? Suggestions?
Secrecy is a habit i'm trying to overcome....