I am creating a skimmer simmular to the CPR backpac with some improvements (useing a Maxijet 1200/900) and also making another that looks something like yours but with a smaller pump (maxijet 1200). I am playing with the ideas of a larger box and a 4" acrylic tube attached but being about 24" high on the tube alone. I am going to see what I can create that will work in a confined space of under 30" tall and a footprint of about 8"x6".

I really liked my Berlin Classic XL when I had one but wanted to make something a bit easier and more proficient. I did the popular mods with a venturi and a bigger pump but didn't care for the results. I'll be setting up a new tank in the next week or so and I'll post the pictures of the skimmers in action.