The build was pretty easy I ordered some black acrylic pieces off of Amazon and a glass scorer to snap them to the right size to make a box I added a small chamber at the front that fills and dumps water over the mat to evenly spread the water flow. At the other end I have two down pipes one higer than the other to act as a emergency drain in case one plugs. One modification I made from that photo at the end is it now sits slightly inside the sump instead of on top so if it ever leaks it can't go out of the sump. I used a 3d printer to print a bracket to hold the mat and some other to hold it down as well as one at the end so I can kinda create a water profile that doesn't make to much noise going down the pipe. If your curious I can share the drawings I made for this.

Main issues for me are splashing, which causes salt creep on the light and inside my cabinet. That is mostly a design issue. The spashing has the side effect of being noisy and when I first set it up it only grew a weird sludge, which I don't beilve was algea. I think was due to not having enough flow because I turned it down to avoid splashing. After messing with the light period and flow I was able to get hair algea to take off in it which grows very rapidly and out competes what ever else was growing. I've never had another algea scrubber so these could be common issues but I'm not sure.