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Depends on your machine capabilities, and hold down method. A 3/8" bit is probably capable of cutting 3-4 times faster than a 1/4" bit.
 

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With a machine like that, then a 3/8" bit would be up to 4x faster.
However, at high speeds, with narrow parts like those, you may run into trouble holding the parts still.
 

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I'm sure you could cut through 3/4" ply one pass with a 3/8" bit. I do it all the time. With decent plywood and a new bit, I can run a 3/8" Vortex 3 flute compression bit right around 1,000 IPM @ 18,000 RPM. Cuts through 3/4" ply one pass no problem. You must have a good ramp in and ramp out.
Now as it gets dull or resharpened, it won't do as well. So I drop the feed speed back down to 900 IPM.
 

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The only problem I see with the design is, no bevels on the ends that sit on the ground. Every good sawhorse has beveled feet to distribute the load evenly. This sawhorse is my design. It stacks and could be cut on a CNC, but some secondary operations would be required.
Rectangle Parallel Font Slope Schematic

P.S. The horizontal 1×3 tie would be eliminated for stacking.
 

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Personally I have never cut CDX on the router. I would contact my tooling supplier to see what they recommend for the cutter. I defiantly would not try a ¼ cutter unless I had a dozen or so on hand. I would think that the Glues that are used to manufacture this stuff are a lot harder on the cutters than a cabinet or furniture grade Plywood. Also from what I have seen in the lumber stores this stuff does not lay very flat so you may have to come up with a system to assist in holding it down. Here is a link to a similar subject.
http://www.woodweb.com/knowledge_base/Cutting_CDX_on_a_CNC.html
 
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