RE: poll, a second floor would be nice, but maybe should be held off until z levels. It could work as a basement, but malls tend to be open areas, and having the two floors separated wouldn’t be very mall-like. Alternates would probably be easiest, just keep the same layout and change around loot levels, some terrains, and spawns. Most work and most payoff would definitely be creating new large scale specials.
I was reading about cheyenne mountain and raven rock on wikipedia and it gave me an idea for a special for a bunker that would include a small aboveground mountain area and then a large lab-style underground military complex. Imagining it’s a 9x9 square, the aboveground area would look something like this:
[tt]
FFFFFFFFF
FF^^^^^FF
F^^###^^F
F^##O##^F
-HOOOO#^F
F^##O##^F
F^^###^^F
FF^^^^^FF
FFFFFFFFF
[/tt]
F’s are normal forest, ^ is forest on the outside, rubble in the middle, then solid rock on the inside, # is solid rock, - is road, H is a checkpoint style installation, and Os are the interior.
It obviously doesn’t have to look anything like that, but that just gives an idea. The road should connect to a checkpoint, and if a gate at the checkpoint is raised then it can be driven into by a military sized vehicle. Once inside, it should lead to a large storage/staging area, then massive blast doors leading to an entryway with some administrative areas and freight elevators and stairs leading to the rest of the complex. Down below it should be lab style, some combination of offices, barracks, storage, high tech communications equipment, armories, maintenance areas, etc. Some areas should still be running on emergency power, but everything non-essential is going to be off. The bunker was being used to store VIPs, mostly scientists involved with the blob, and being used to stage the VIP extraction teams tasked with locating and returning those scientists. Because these scientists were working on trying to reverse engineer the blob’s effects (in a less drastic way than the dimensional rubberbanding they had already discovered), a few areas of the facility have been repurposed into makeshift labs. Since the facility is mainly involved in communications and coordination, there should be lots of information on hand about the blob and its spread. It could potentially even include the ability to communicate with other similar facilities eventually.