Just a few helpful hints that I've discovered whilst playing around with lair building on Blight. BIG caveat--all this is subject to the bugs (and hopefully fixes) that have popped up on Blight, and will pop up once the lair auctions end . . . .
Is Lair Planning Just Like Plot Planning?
Not even close! First off, unlike the neat, rectangular shapes of biped plot structures, lair chambers are irregular in shape. They do not fit neatly into corners or edges of the lair or adjacent to other lair structures.
Moreover, chambers and corridors each have specific "connection points," unlike biped plot structures. If you want to be able to enter/exit a chamber/corridor, you'd better have some chamber/corridor attached with a connection point and an exit point for that chamber/corridor.
Finally, you must be aware at all times of the height of lair structures. For example, a Tier IV lair will take up four levels of your lair. This means that if you plan that lair at level 4 of your lair, it will take up the same footprint not only at level 4, but levels 1, 2 and 3 as well. So you must plan around that structure at other levels. As a rule of thumb, each hall/lair requires one level per tier.
How Do I Create Ways To Go Down A Level?
Three ways--build a Slope, build a Covered Spiral, or build an Open Spiral. Of the three, the last is far and away the best. Slopes take a ton of room on a level, and Covered Spirals are dizzying (to put it charitably). Open Spirals take just a bit more room than Tier I storage silos, the smallest chamber available.
One huge caveat: Open Spirals reverse their connection points on the next lower level. So, never build an Open Spiral so that 180 degrees from its connection point will be a wall or other non-escapable point. Your best bet is to place Open Spirals somewhere near the center of a lair level.
Can I Build An Entire Lair Plan At One Time?
No. Youcan build only one chamber/corridor at a time. Let me clarify . . . . If you plan all levels of your lair and click the "Build" button, you will not be able to put anything in the Build window unless the structure you have highlighted is connected to some chamber/corridor you already have under construction. In other words, you must "Build" one chamber/corridor at a time, and then only if that structure/corridor is connected to a chamber/corridor already under construction. Once you can access any built chamber/corridor, you can contribute resources to any chamber/corridor connected to it.
Bottom Line: Unlike biped plots, you can only contribute resources to unbuilt structures connected to already built chambers/corridors.
How Can I Best Gain Lairshaping Experience?
There are two ways to gain Lairshaping experience--making end construction units, and applying them. According to posts by the devs, Lairshaping experience is devoted 20% to making end construction units, and 80% is devoted to actually applying those units to lair chambers/corridors.
That's all I have for now. Please feel free to add to (or detract from) what I've posted here . . . .