This is a link to a Google 3D SketchUp drawing for a desktop trebuchet. You will need the SketchUp software to download this drawing and its freely available online. We do not provide support for this software.
This clock holds a secret chamber under the lid, and its construction involves a few secrets as well.
Usually I go straight from paper sketch to working with wood. On this desk organizer project, I thought it was worth the price of a 2×4 section of plywood, plus an evening or two, to first make a prototype.