update
First time ever using the foam, and jesus, its a son of a gun to work with!! Im not 100 percent happy BUT, ill wait till its cover in peat moss/coco fiber to make my call lol.
What I ended up doing was skipping the waterfall idea on my first build. I ran a PCV pipe in the back right corner, and one in the back left corner as well. This is going to be for my external filter. One tube for intake, one to spit the clean water back in the bottom. Some might say, whats the point. I figured I didnt want stagnant water kickin around, so I figured I could do it this way and keep it flowing and filtered. If i find the pump is useless, then I will still be able to drain the bottom using the pvc passage
I foamed tonight and put in a few planting cups ( notice the gs foam lid on one, thanks beck lol)
Still lots of things to do to make it look right, but its a start!