@devnull I would recommend adding washers to those nuts to prevent them from digging into the wood over time, and 4 screws on the corners to prevent the board rocking when loaded/unloaded.
Not the typical reunion but I guess it works for simple practice.
I would tottally do something like that if I was allowed to in any case.
This is how it starts, and it ends with a climbable wall in the garage xD It's a matter of time.