Here’s the ISO of what I built, Guy.
Here’s how it was put together: Shapeoko table plans
I didn’t put any fasteners at the half-lap joints; just glue. The top and bottom only had a few small brads to lock the grid to it while the glue was drying.
Rock solid flat for over a year now. I bought legs from Amazon and added a shelf below for the dust collection.
EDIT#3: The grid is on 8" centers, and the table is 4" thick.