I'm working on a prototype for the space station in creative mode; the airlock wiring is going to be a bit of a pain. I plan to fill the station with lava, because you don't drown in lava and it gives psedo-weightlessness(instead of ladders, you'll just be able to fly up; similar to the space shuttle's design(except they used physics instead of lava).
There'll have to be an alchemy module with a stock of blaze powder, nether warts and slimeballs(and redstone); that's not too big a deal. I'll also include a private cargo area near the airlock, in case someone wants to put up their stack of diamond blocks before entering. I already checked, and chests don't burn up in lava(go figure); I'll have to do some research to see what does.
I've decided to build the walls and floor out of stone slabs; I would use iron blocks, but that would be ridiculously expensive; part of the reason I'd like some partners/co-sponsors and/or supporters of this project, because I could build it quicker and better in creative mode/with mods; but it's worth building it on the server if people get enjoyment out of it; the converse of this is also true.
One thing I've not been able to decide at all is the entry mechanism. There's essentially four or five(six if you count ridiculously expensive)
The first is the simplest to implement; a piston holding back a water block. Release the piston to deploy a "tractor beam". Advantages are it can be used to get back down. No disadvantages other than not being as cool as some of the others.
The second is a piston holding a stack of gravel/sand up. Once you get to the station, you would deploy water(possibly tied in to #1) to wash away the redstone and collapse the gravel tower. Disadvantages would be that it's expensive if there's nobody to collect the gravel, and it would take a while to get up to the top.
The third is like the first, but with lava, and permanent. This way people know what they're getting into, and has a higher awesome factor; disadvantages are, it's a tower of ******* lava.
The fourth would be the simple trapdoor teleport trick. Advantages: easiest to implement. Disadvantages:super yawn.
The fifth would be a tnt cannon; Advantages:awesome, the most realistic. Disadvantages are impossibly expensive and requires a space suit made of expensive hyper-pressurized carbon.
The sixth, and the one I'm experimenting with now, is a space port/shuttle (perhaps on sky city, if I get the approval from whoever is the mayor, alternatively, the desert might be a better option since it's closer to a nether portal and there's no immersion breaking rain).
Here's the vehicle I'm thinking about using. It would be made of nether bricks/nether stairs. Advantages are it's pretty awesome, and reasonably affordable, and can carry many people at once. Disadvantages are it's a bit slow, requires you to start from a high point, and I'd have to build several with several docking ports, as well as an astronaut training building with instructions on how to operate in, in addition to snow/dirt/sand and levers as "fuel". Neutral traits:It's like a rowboat but it's a spaceship.
Feedback on entry method is very welcome.