I'm in the process of creating a plugin to build castles and stately homes and such from within DBP code. I havent got anything to show you or to upload yet, but I will in a week or two.
I'm creating the plugin as part of a larger project (a horror FPS) and I want to model a building based on this place
http://www.youtube.com/watch?v=MdwU9nGsH7E
an example of some commands (CCK = Castle Construction Kit)
CCK USE BRICK TEXTURE INTERNAL 1
CCK USE BRICK TEXTURE EXTERNAL 2
CCK MAKE WINDOW framestyle, width, height
CCK MAKE DOOR framestyle, width, height
CCK MAKE WALL x, y, z, length, angle, windowframedata, doorframedata, gabledata
CCK MAKE SPIRAL STAIRCASE x, y, z, stepheight, stepspersweep, radius, windowframedata, doorframedata
CCK MAKE ROOM x, y, z, width, height
I'll start a thread in WIP soon with some examples, screen shots and a youtube video