Since 1.8 came out, my old fortress has been bugging out like crazy. So, grudgingly and with much disappointment, I left it behind me and proceeded to work on a replacement. Not wanting to waste so much time on constructing a fortress from scratch in Survival mode, and not wanting to lose the challenge of Survival, I decided to download a console command mod to give me the abilities of Creative mode without losing the ability to revert to simple old Survival mode.
The end result:
The Epica Fortress


I was inspired by multiple things in the design, most notably the Chernobyl Sarcophagus and the helmets of a few notable figures in fantasy culture

block for block, this one is very likely smaller than my mountain base, seeing as the doors on this place seem much bigger in comparison to the overall scale compared to the base. I intend to supersize it if I ever find a mod that boosts the map height a few hundred blocks.
The lava KP Logo makes a return here, with 4 of them laid out across from each face of the tower.
http://i56.photobucket.com/albums/g198/ ... ibrary.png
The Library is set in the lower half of the tower. the lava you see running down the walls between the heat-sink-styled grills is the same that you see behind the glass in the library.
http://i56.photobucket.com/albums/g198/ ... ngarea.png
The kitchen is where the food is cooked, as well as where ore is smelted. using lava as lighting and an on-hand disposal point for anything I have but don't need.
http://i56.photobucket.com/albums/g198/ ... ehouse.png
Storage for the resources I gather throughout my time in the game. split into Ores, Organics, Tools, Utility items [furnaces, chests, redstone torches, flint n' steel, ladders, so on and so forth], construction and items gathered from the Nether and the End [when it's introduced]. In the centre is a magma pool that's used for waste disposal. large amounts of dirt that I cant use gets dumped there, among other things I deem useless.
http://i56.photobucket.com/albums/g198/ ... orge-1.png
The Forge is where 90% of the lava I gather is located. fully stocked it's capable of generating between 250 and 278 blocks of obsidian. It's also very convenient as a mob trap if they ever manage to break into the fortress.
http://i56.photobucket.com/albums/g198/ ... icRoom.png
Finally, the Panic Room. If everything goes to hell, I would lock myself up in here. double layers of blast-proof obsidian. I plan to add a layer of water flowing down the walls from the roof of the obsidian cube so that blocks inside the room aren't damaged by the blast in spite of the shielding. at present, the walls would not break, and you wouldn't be hurt, but blocks placed inside the room can be destroyed by the shockwave passing through the walls. annoying, but avoidable with water. there's a lava fireplace with glass separating it from the wool flooring, a furnace to the side to cook the food stored in the chest, and a workbench for making whatever tools or weapons or other things I could possibly need [including cake. cake's nice too]