Ok, progress report and effort coordination:
Much of the work on the Fenris basecamp is done: tree farm, rail station, cobblestone generator, storage units, mini-farm, smelting stations, and of course the co-ed dorms are all up and running.

Much thanks to Shade for the initial structure, storage, smeltery, and dorms, and to Pred for the railway station and other materials.

Some thoughts on the exact location and construction process:
- Normal render distance is around 100m, so the Fenris should begin no farther than 90m or so from the rail lines.
- Underwater excavation being the b*tch that it is, we'll probably opt for a WorldEdit-powered water removal from the scene of the crime.
- The rest of the area needing excavation down to bedrock should be done by hand/TNT, since we'll probably need all the stone we can get.
- To any op: can we get a warp point in the Fenris basecamp building?
I'm seriously contemplating building a high-efficiency mob trap to generate the sulphur we'll need for all that TNT. Having an initial stack of TNT for excavating the trap would certainly help get our up and running quickly... anyone got spare TNT to lend me? You'll more than make back your investment...
The only other thing to do right now is probably to mark off the 253x70 bounding box with blocks in the corners, and then to build the side view out before any of the actual levels.