So... I saw that this game was awesome and eventually got it -- because it is awesome.
The main thing bugging me about it ls lack of a Linux port and poor Wine support (I eventually got the 32bit version working with no sound or file integrity checks, but some severe graphics issues (spotlights, turret lasers, placement interface, muzzle flashes, etc. render as black voids), intermittent (and probably easily solvable) control issues, and general sluggishness make it less than enjoyable), but as I have a (almost unused in the past months until I got Space Engineers) Windows partition on my gaming PC, that's fine. Pity I won't be able to play at University though.
Are all the aforementioned servers dead, or is there still somewhere I could play with Bay12 people? A Bay12 server or a Bay12 faction on another server? Creative or survival, vanilla or modded, I just think the game will be even more awesome played with awesome people.
On the subject of gravity cannons, after seeing a youtuber (I think it was LastStandGaming) showcasing a Workshop ship, I experimented with rock-throwing cannons in Creative mode. Turns out you can use the same gravity generators as a gravity cannon AND a hyperdrive. Therefore, I made a 'freighter' that had what was apparently some kind of crew compartment (place for your assemblers, refineries, medbay... maybe some more cargo...) behind the front cargo containers actually full of armoured gravity generators (and a tiny pilot station in the back). It generated a 20g field (some SCIENCE is needed to find the speed limit for ore boulders, and the most efficient way to reach it, as mine was using less than half of the length of each generator's field) for a fair distance in front of it, and could either drop cargo from front connectors (this breaks it up into smallish (336?) boulders that still went through at least one block of station heavy armour) or turn on artificial mass blocks for rapid escape acceleration or RAMMING SPEED!
I haven't tried firing it on targets with spherical gravity generator shields, which will probably take direct hits less intensely and scatter glancing blows away from them.. (You can do that now, there are spherical gravity generators that can push or pull in a radius around them!)