To avoid having to hand-cut mortices and sliding dovetails when replacing the sacrificial top, I just screwed it to the top beam.

I used round pegs throughout, though I like the square pegs and will use them in my next sawhorse.

I did the diagonal brace to post connection as in the original version, i.e. without a thru tenon and with a flat, parallel-to-floor bottom: The diagonal to top beam connection: Here's the diagonal brace crossing under construction: I did the post bottom and bottom brace connections per the original scheme, i.e. with double intersecting tenons. I lost a bit of wood inside the feet trying to get all those mortices in there, but once together it seems pretty solid. Unfortunately, I got so engrossed in the work I forgot to take pics.

Another fun, informative project. Thanks.
Looking forward to the next one.