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On paper you should have at least 8 ideas on your paper , Each sketch will have at least a Joint and to be possible to make. So the first Step was i used a Steel Ruler to measure my my numbers. Then the next step is that i Used a Tri - square to measure the measurements from my paper to the wood. The next step is I marked a square line at 90 degrees across and along the edges using the Trisquare.
So the next step is that I cut of the piece of wood with a Handsaw. I then marked out the groove with a Marking Gauge. But I haven't finished but here is a photo.