i dont quite understand how you want to do two sepered loops with it.
it only has 3 flow chanbers
i think it needs 4 to work with a dual loop systehm
4mm each, the middle one has 10mm thickness. I chose 4mm for the external plates simply because I happened to already own them physically. I went for a sandwich method because the front face is supposed to have no holes except for the screw ones.whats the thicknes of the two pices yof acrylic for the top and botom of the reservoir ?