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In this video, we do box joint jig easily. I not have guessed that interlocking pieces of wood could be so durable. Wood joints with box joint are very solid. The few attempts I've made have surprised me. It was extremely solid.
You can easily make this DIY box joint using some plywood. You can start doing it after downloading the PDF plan from the link below and watching the video.

Making Video :
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PDF Download : BOX JOINT Making PDF
Did you see this ? Table Saw Crosscut Sled Making
In this project I started doing a great band saw. I used plywood as the main material.

How to a make marking tool. 2 in 1 wood tool. Beam compass tool and marking gauge. Simple, homemade. You can mark to cut wood in the middle. You can draw a parallel line.