Update: basic functionality restored for the Kilrathi faction, player-only (no AI) building, icons, research and combat seem to work so far. The Confed faction has basic functionality too. This means a beta release is extremely likely for the CIC birthday party, albeit the status of the release will probably not be as advanced as the previous stable one (still have problems with the wrecks, for example). I have yet to decide whether I'll try to improve the two main factions or attempt to get the last two operational for a release, though at the moment, I'd be more for the first solution, to try and get wrecks and the new fuel scripts, since the UBW and BL factions still need a few more ships and subsystems to be pushed to the new quality standard. Definitely no AI to be expected by then, however.
Thanks to some help on the Gearbox forums, I got the fuel and ammunition scripts to work, and they are much, much better than before, smoother and more precise. Combine this with the increased stability of the MP from the official 2.0 patch and I dare say we actually might get a few games running around the birthday party since these are the critical gameplay features I consider necessary for a good experience. Most likely Kilrathi/Confed only, though.
Anyone interested to set this up? If there are people who'd like that, I will most likely do an early release so it can be beta-tested for bugs and crashes.