I think your return pipe only needs to be as large as the output on your pump, I think 3/4" is about minimum. You can run it whereever you want, really. I would do your overflow a bit larger in case it plugs up, and also because it only has gravity to move it and therefore may not be as high of a velocity as the return pump. I have a Mag12 return, 1" return pipes and a 2" overflow pipe.
I also have a pine Billy and designed my stand to blend in with my room, which is all pine.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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