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After watching this video, you can download the free PDF document and make it easily. There are many 90 degree corner clamp videos on youtube. But this is a little different from what I did, let's see, do you like it?
Making Video :
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PDF Download : Right Angle Corner Clamp Making
I made a new drill press for myself. You can see how I build it in this video. It is a very beautiful column drill. You can download a dimension PDF

When you watch this video, you can learn to make a center marking tool. The center finder is a useful tool for woodworking. You can mark a cylinder or square.