This is an idea I came up in the last couple days for a Hang on Back version.
My idea of a HOB "Super" UAS filter. Left side is the intake for it, pump is under the box externally. There would be a surface skimmer box around the intake tube.
Water gets pulled through the surface skimmer and the pump injects air to create the bubbles and is attached via a bulkhead, then the bubbles come out a slot in bottom that has a piece of acrylic drilled like a bubble plate inside. The slot is big enough for the screen to fit very loosely in the slot. There lid that has 2 angled pieces glued to the lid to provide a path for the bubbles to go into a collection cup but when you pull the lid off it makes it easy to reach in and pull out the screen, when the lid is on the screen is held firmly in place. There will be an exit path for the water on the right with another baffle to block bubbles. Then it will drain through a media chamber where you can put in carbon, purigen, GFO, etc, and down the bottom and back up to the return line. There will be acrylic windows and I will use 7 LEDs per side. Box dimensions are 9" wide, 8" tall, 3" deep, screen size is 6" tall x 4" wide.
I think I am going to build one in the coming weeks just for the heck of it.. should only cost me a few dollars in plastic, I have everything else to do it.
On top I would put a CPR Backpack skimmer cup with an O ring to hold it in place.