I built a Moxon Vise from Bench Crafted planes on his web sight.
1. It was big and heavy. Mass and weight I believe it that principal. But storage was a problem.
2. Clamping it to my bench was a pain at least in my eyes. The weight of the front jaw tended to want to pull the vise off onto the floor.
3. With the height of the vise added to my bench height it tended to put things a little to high when sawing.
I wanted to build a new bench and wanted to incorporate all of the things that were missing from other benches I had built. I thought an in built moxon would be the way to go and I still think so.
I prefer a shoulder vise over a leg vise, and a tail vise over a wagon vise. I also like to get up close and personal when cutting dovetails and the shoulder vise put me back a little farther than I like. I did however shorten the shoulder vise screw 2 inches, but shoulder vise still put me back a little farther than I like. I also like to angle my body somewhat for the natural swing of my arm and a Moxon allows for that. So here goes the design on the fly.
The most important being height. I just used the saw and cut lots of cuts until I found the most comfortable height for me. The height of the bench was firmly established so all I needed was the height of the wood to be cut measured front the top of the bench. Then I could establish the height of the moxon.
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The rest is history.
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And I hope I have added a lot of different ideas into your bench build.