I second czcz's comment. I think you've got it all planned out pretty well.
As for PVC
- don't bother with any website, just go to HD
(early am when it's not busy) & hunt through the bins & dry fit the whole thing together ... then you know you have the right parts! PVC
's are pretty simple, you have straight pipes, T's, L's (elbows of various angles), reducers, caps & crosses. Just have a rough layout drawing of what you want & hunt through the bins.
I should tell you that there are 2 ways to connecting PVC
's, screw on types (more expensive) and cement. You can take apart the screw on connectors for cleaning but it will cost you. Personally, I use a mixture - I use cemented part mostly for low cost, but place screwed on parts strategically so I can take the thing apart for cleaning. BTW
- a "clean-out" port is a good idea also - I have it in all my house sinks - a cinch to clean out a blocked drain.
I used white PVC
(rated for drinking water) for my fish tank, although cheaper black (sewer) PVC
prob will be OK too.