So I saw Sk8ermog's Eclipse-framed "Tiny Mag" in his sale thread...
Then I saw a similar frame on eBay almost the next day, and bought it....
And after a few evenings of fiddling, viola!!
At first I was just gonna use it like any normal frame. The mounting holes line up perfectly, so I just needed to remove some material from inside the frame for the sear arm to hit the trigger. But then I noticed that the frame already had some holes drilled for other stuff (Autococker timing stuff, I'm assuming). And I had some left over sear-arms from pneumag builds. I started wondering what would happen if the sear was lengthened and lowered.
So I attached one sear to an expansion pin that sticks up through the frame.
I removed the other sear arm and shaved down the sear a little bit so it can easily slide into the pin.
I also had to shave some material off the trigger and custom make a safety, but hey, all in a day's work, right?
Sadly, this will probably go up for sale soon. I forgot that chrome really isn't my style. But I've still got to test it first, and I need to drill a hole for the twist lock assembly, so at least I get to play with it for a while. The funnest part is building it, anyway.