Well everything is now cut and pre-assembled. Finished it all up on lunch break. Cut the pipe to size and made sure everything fit together nicely. That loc-line adapter ended up going into the elbow I bought. Not as easily as the other PVC
pieces but it'll work fine.
I have another home project to work on when I get home (repairing tiles in the bathroom, yay) but after that it'll be time to plumb the tank! I should have about 30g of RO
water brewed so I can get that into the tank and start circulating it as well.
Updated the drawing on the Drain system to how I ended up cutting it.