Ah, very nice! I didn't realize that you'd have to cut the body shorter. Interesting. 007 sear as I'd guessed... It's such a cool little package! What was your inspiration for doing this?
I've always liked Nelspots, but think steel is such a lousy and heavy material for paintball guns. I also had racked the brain for a long time trying to figure out a way to get the 12 gram into the grip frame of a Phantom. There just wasn't an easy way for me to do it with very limited tools (and wood working tools to boot) to work with. The Nelspot grip frame was close to being a bolt on option. I could handle cutting the body and slots.
I'm planning on a second edition. I'd like to use a Phantom valve body, and use a stock class body. The whole design would be a lot more stable if you didn't have to cut the body. One of the major flaws in the Nelspot design is how the tightened 12 gram throws all the internals out of alignment. That why a Nelspot can be as smooth as silk before you air it up. Then after you air them up they're about as smooth as burlap! The way the Phantom valve fits inside the body, it should be able to take that "upward" push of the 12 gram a lot better without binding up the internals. Plus the valve is not a big chunk of painted steel!
I have some other ideas, but again, I don't have a metal shop. I have a wood shop. My drill press is great for hogging out holes on raised panel doors for hinges, but to put a precise hole at the right angle, in perfect alignment with the threaded insert, then tap it for an extended pierce pin, is a bit harder! It could be done if I took my time to build a good jig and clamp, and set it up on some crap pieces before I trashed a perfectly good Phantom valve!