(This is really inspirational stuff, especially as I dabbled with some experimentation recently.)
Thank you!!
(So here's a question to you: what do you think is the minimal amount of ore mass to get a viable minimalist drilling rig down to the undersea bed.)
The amount of Ore depends on how many parts that are use with buoyancy, some items like the MK1 have lots of buoyancy and require lots of weight to submerge them.
(So one drill plus infrastructure (power plus radiators) fuel tanks for storage plus one habitat module (e.g. Hitchhiker) plus a dock for a sub (possibly via Klaw)?)
Yes the Klaw is very useful for these task, but not my preference
(With two ore tanks (total 3,000), I found just extending the radiators caused it to lift-off from the bottom. And apparently, drills do not in any way anchor the base to the sea floor...?)
Extending radiators creates lift is interesting and sounds useful, thanks for sharing this. Not sure about the drills anchoring I haven't tested this.