Summary

This is a disassembled and flattened version of Castle Under Attack by Andrea Garuti, suitable for laser cutting.
Original CAD files here
http://grabcad.com/library/the-castle-under-attack

Edits: (All old files will stay available, but you only need to grab the newest one)
Rev1 01-11-2015: Tebuchet had wrong size on some bucket pieces and upright holes, catapult2 had catapult1's top beam.

Instructions

This is a hand-disassembled and flattened version of the astounding "Castle Under Attack" model by Andrea Garuti.

Andrea's model was the grand prize winner of the GrabCAD/SolidSmack laser cut toy contest.
http://blog.ponoko.com/2013/05/02/awesome-laser-cut-castle-under-attack-features-working-catapult-trebuchet/

His work is so awesome, and it's so generous that he open-sourced his model files that I just HAD to generate a flattened, cuttable version for the masses.

The original source file is an assembled version of the 1000+ piece 3D scene and is not cuttable. These files are hand-disassembled, snapped to x-axis, and flattened (2D projection) in Rhino to laser-cuttable pieces.

I am 99.9% sure there are no overlapping lines or other cut-killers, but some of the 30mm circles (wheels) rendered oblong, so further cleanup of the files will take place as time goes on.

So far, I have cut a couple of the siege weapons with good success. I will upload pics soon.

If anyone wants the disassembled but unflattened IGS files, or is able to contribute to this project, please message me.

Flattened and CUTTABLE "Castle Under Attack" - Original laser cut model by Andrea Garuti