Modular castle kit - Lego compatible

UPDATE (feb 2017) This version is deprecated. If you start new, please take http://www.thingiverse.com/thing:2141175
"Blocks" that can be assembled into a large medieval castle, Lego-compatible size
Your choice:
- Print bricks with base platform attached
- Print stackable objects that you can put on top of a base plate
- Combine the two
I had the following in mind:
- Reduce print time.
- Provide incentives to be creative: kids can adapt and expand with their own bricks
- Should be easy to print
- Should be sturdy
- Should be expandable by people with minimal openscad skills (create your own blocks)
You don't need all the pieces. Look at them and decide. A single castle-tower.stl can do for starters. By XMas you should be done printing a reasonably impressive set :)
File names:
- By default, bricks have a flat bottom and are not stackable (easier to print).
- All files called *_legobase are stackable, i.e. can be put on top of a base plate or other pieces.
- File names including _16 use a larger 16x16 base plate.