When you get bored......

[golf nut]

If you are concerned about the herbie then do the overflow deeper, lose just 2 outlets from a 2 way at the bottom of the back of the tank, the upper 2 are doing nothing to help the flow anyway the way they are drawn, get the water to move from back to front at the bottom, fire the sump returns down the back glass, by doing this the surface water will move from front to back and get the best pre skim.