I've been testing on MT 5.5 these days. I'll release a new version right now, I just wanted to make sure it wouldn't break. The API hasn't undergone any change that should affect it anyway. I might be less cautious with future MT versions :)
Okay, I set 'autobox' as a submodule and worked around the issue qith it in Nodeverse code. I integrated 'hand' into 'rocket'. 'player_api' does not seem to have its own repo, but as you said, it follows upstream (other games appear to be doing the same). I'll send it in for further review.
I believe Hand is the exact same mod by celeron55, but I'm not sure if it's exactly the upstream version. Is there anywhere I could find the original code and put it as a submodule? And, regarding Rocket, it doesn't show as a name conflict, but it's a temporary mod anyway, I will develop a new spaceship implementation in 0.2.0