Before I go on Christmas break, I figured I'd post my progress with my T19 variant, "QT-19".
It's still a bit of a WIP, some kinks still need to be ironed out, but it's game-viable, hitting 160FPS fairly consistently on half-darts and 9.0mm flywheel gap.
This PDF covers what I've done so far:
https://github.com/GrubbyLittleRaccoon/T19variant/blob/main/T19%20notes.pdf
You can find the rest of the files (STLs etc.) here:
https://github.com/GrubbyLittleRaccoon/T19variant
Happy holidays, all!
~J