Alright. Sorry for the late reply! Now this was a nice idea dump! Love it. Will quickly comment on some things:
Drills and lasers are actually coming (not in the Demo but in the Playtest branch). I haven't decided how stationary drills should work but your implementation idea sounds solid!
Love all the ground and terrain ideas.
Thank you so much for the feedback! 🙏 Let me know if you have any more.