Good job
I prefer your design much more then the one I just built.
I built the standard 6 tub stack rack and my basement ceiling height is only 6' high so I don't have room for the bucket on top for an automated water system.
And my wife is only 4'11" she needs a little stepping stool to look into the top tub and on her tippy toes for the second top tub.
I'm just about ready to built another using your design, specs would be awesome bro.