I like your implementation. Your box design is better than mine by a fair shot. I like my
little giant pump better, tho.
I concur with the others that the 90 degree turns are definately flowrate killers. You might want to investigate a way to get rid of them for your next version. All in all, it looks fairly spiffy.
If you want to take a look at my attempt to get some possible ideas, the pics and such can be found
here