I'm getting to the point in my workbench build where I need to stop overanalyzing everything and commit to a design. So, I'm submitting it to you all for a final sanity check.
The overall design is Moravian, with an angled leg vise and traditional tail vise.
The top is currently a single 3.5-4" slab of white oak that I am going to saw into a split top because it's too cupped to practically flatten in one piece. Splitting the top will also improve its stability because it will create two rift-sawn slabs instead of one flat-sawn one.
The leg vise chop and parallel guide will be hickory. I'm not 100% decided on the tail vise materials, but it will have at least the important structural components made out of hickory.
The long stretchers are joined to the legs with a Shitage Kama joint. I have used this joint before and I feel that it is more robust and more attractive than the standard tusk tenon on the Moravian bench.
Right Quarter View
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Left Quarter View
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Front View
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Close-up of parallel guide with leg vise chop hidden. It will be an all-wood version of Will Myers' ratcheting parallel guide. Edit: obviously the ratchet isn't going to balance as rendered. There will be a spring to hold it against the parallel guide.
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Underside of tail vise. There may be a few more guide blocks in here but I'm not 100% sure where they need to go and I didn't feel like rendering them. It shouldn't be a problem to figure that out as I build it.
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I may add a narrower version of the upper stretcher/apron on the "21st Century" bench here. The dog holes in my design are close enough to the front edge that they will interfere with a sliding deadman. I also feel that this design is more robust than a deadman.