Gorobay,
I really enjoy the homesick Chemist. I bet the other Chemestis pick on him too. I also bet that his journal has the best formulas in it.
One of my thoughts was to assign out the journal writing, you be a Chemist and you be a Miner and write such and such a journal including the following clue(s). This sort of thing makes a great project for people who want to contribute, but don't have much time on their hands for extended projects. I think you would be great playing this guy's part if you want it.
Sabotage is another excellent subject to bring up, it should at least be wondered over but has great potential for a major plot element.
The map is great! I especially like the gas delivery system you designed there.
Not to step on your ideas at all, but let me have a turn now and put out what is in my head:
This age was Written with an extrordinary amount of silicone and a very slowly declining temperatue starting in the extreme high temperatures and cooling off through millions of years down to a habitible climate, prehaps it is a rouge - slowly escaping the pull of a star, perhaps the star is it's orign. It begins as a boiling mass of molten glass that cools from the surface to the core sealing all that energy in a planetoid-sized and very wet and dirty glass sphere with a bizarre and distorted surface. Of couse a large number of "bubbles" are created by the conflict between the energy below and the entropy above, this network of bubbles create "seams" containing different types of heavy gasses. Bio-friendly gasses are light enough to float to the top but heavy enough to remain in the gravity. "Dirt" is rare in this landscape, but exists in clumps and we do have at least one ocean, as a minimal justification for supporting life.
That last bit is appallingly bad science, but maybe we can get away with it. Pryftan, I might need you to call up your Gifted Writer character to justify this mess.
The natives are total primitaves, but uncannily intellegent; they are in bad shape because food is so tight and the environment is less than friendly. Somehow, we managed to strike a deal with them in which they help us extract the gasses in exchange for aid and evacuation (uhoh, I hope I don't need to bring in the Healers Guild!). Mining this age is a process of drilling long shafts through the glass at precise angles and then sucking or pumping the trapped gas into storage.
The mine itself is less of a cave and more of a rig, I'm dying for a scanner right now so I can just show it to you. But take a look at this site to get a vauge idea of what I'm talking about:
http://www.asteroidmines.net/documents/MiningRig/RigForMining.html
Imagine this rig deployed on our planetoid with those spikes drilling deep into the surface. Of course, I don't think ours came from outer space like this guy, also it should be much more homey and spacious inside.
The "gear door" is not so much a machine designed to open a door, but more of a gear that must be shifted to gain access to the door. Perhaps this room was the "industral linking chamber" designed to bring large gas containers (and perhaps refugees) back to the cavern. The heavy equipment's orignal purpose could have been to deploy large tanks of gas. This room is a good candidate for the epicenter of the destruction.
A possible reward could be a little garden age that was intended to be the destination for the evacuated natives, I'm leaning towards an unsucessful evacuation, so it would be perpetually ready to recieve people who will never show up. If Cyan loves us maybe we can even make it a global area.
Okay that's enough to chew on for right now, tell me what you like and what you don't.