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Modular Origami: Sonobe Polyhedra
K2 - complex modular origami sculpture - no glue
Origami Sculpture Puzzle: 4 Intersecting Cubes
Gasherbrum - 4 intersecting triangles - modular origami - no glue
Double Makalu - Origami Scupture: 12 woven pentagons (no glue)
Icosahedron Modular Origami
Seeing as either one would have the same w:h ratio, 6:1, feel free to use either. The only difference will that inches will produce a larger end model, and vice-versa for cm. Hell, you could do 1x6m and it would still work, it would just be on and unmanageable scale.
Assassin's Creed Hidden Blade - Functional Prop!!
RC Minecraft Creeper Robot
R/C Steam Turret Tank
Electronic automated hidden stash built into table (easy and dirt cheap)
How To Make A Super Secret Safe - For Less Than $3