Sorry guys for the lack of answers. We've been flooded with work, but we will try to be better at answering your questions.
1. How many door types are there? Are there going to be iron doors for example? Magic doors? Or is it just a wooden one? Can creatures break these doors down over time?
There are several doors available, so don't worry. And yes - enemies will attack the doors (eventually destroying them) if they stand in their ways.
2. I saw that there are mechanical machines, including what looks like a steam engine and pipes (announcement trailer, at exactly 23 seconds). What exactly do these machines DO? Does it power electric lights, power traps, doors, or what? No one seems to have brought this up. Or is it just for show?
If you're talking about what i think you're talking about, that machinery has been scrapped. Though AGoD still contain electricity, which is used for powering up certain contraptions.
3. Will there be rooms? Or is it pretty much a commune/barracks style where no dwarf has any personal space?
That is entirely up to you. Personally i like to give my dwarfs individual rooms if the space is available. There is no such thing as the "room-mechanic" from DK2 if that's what you meant.
4. Will the aboveground area actually serve a purpose? If we can grow trees and food underground what possible use would above ground serve? or are you going to retool farming and forestry so that it can only happen above ground?
Dwarfs prefer to live underground (as we all know
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
), so the game will primarily take place underground. But you will still be able to visit and interact with the surface, for various reasons - both quest-related and for other purposes.
5. You mentioned a tech tree. What exactly does the tech tree entail? Steam powered golems and technological metallurgy? magic spells? What kind of "tech" do these dwarves have?
I will not go into depth about the techs, but basically most techs will fall into one of following categories - offensive, defensive, economical or upgrades. There are some techs that can't be placed in those categories however. The techs will do a whole lot of things. Easy examples; they might unlock better objects to build or improve upon the dwarfs abilities.
6. How big is the above ground area? Can we build a city there if we wish? Or are we pretty much stuck undergound?
When people are let loose with AGoD, it sometimes ends up with them building pretty amazing things on the surface. But why would any dwarf want to build a city
above ground!?
Oh and yes a question:
How can dwarfs brew beer without water from their underground well?
Tough question, since dwarfs would never use magic!
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)