Nice tank! I noticed that your "herbie" overflow only has one stand pipe. That's living on the edge!
. Seriously though, if you are in fact using that one pipe as a herbie it can and likely will (down the road) block and cause your tank to overflow! Herbies should always have emergency pipes in case the main can not keep up. Also, I noticed that you are using a ball valve on your drain. Those are a royal pain to dial in your overflow water level. Gate valves are so much easier. With the combination of one stand pipe and a ball valve on that line I would be a little worried.
If you want to add an emergency overflow you can drill a hole into the side of your overflow box that is higher than the top of your main standpipe. Then run that emergency line on the outside of the tank and down to the sump.