My sump

[Rikko]

In section 1, just add another baffle to the very end that is placed higher and forces the water to then drain under it as well. I've seen some fanatics on RC have up to 5 baffles in a sequence before return because they were so worried about bubbles.

The design is solid, and no reasonable water pump should put any dangerous strain on the acrylic just by pushing water at it (maybe I'm not understanding your concern about the Mak 4). The thing just needs to be built properly and fortunately it's easier to build a high integrity container out of acrylic than out of glass.

Other than that, pretty good, traditional design.