It's a design I came up with.
Based on the first pic, the water enters the small upper left corner, flows up/over the filter socks. Then into the skimmer section, over/under/over bubble trap, middle return pump section. The return will be tee'd for the sections on the right side. I'm going to use the right side for a 10.5 gallon water change chamber, or refugium. I'm not sure what I'm going to use the other chamber for, in the lower right corner, but it can feed off the tee return or I can use it for ATO.
I drilled the hole to relieve the surface water from being trapped in the filter sock section. I'm cutting some PVC sheet material to mount two 4" x 10.5" socks.
The BA siphon and secondary will terminate into the small section, the emergency will terminate into the skimmer section. The skimmer section is 11.50" x 10.625", 9" height.