That stand is still in daily use. The original kerf value of 8 thousands is my go-to for the thick ply. Here’s a jig that I use for measuring kerf: HOWTO: Kerf Measurement and Jig
If I were going to change anything, it would be to extend the lower part of the cross brace through the leg and to secure it with a peg. I had to glue it in the end, since any horizontal play causes it to work loose. Trying to build without adhesives is a fun challenge, but practicality wins in the end.