Heh, I just got back from Lowes where I picked up all the PVC and fittings I needed to duplicate what you did. I'm proud to say I guessed right on everything except possibly the saddle as I couldn't find a 3" T. So instead I got what's called a 3" sanitary T, where the bottom of the T is slightly offset on one side. I also got a different end cap (a perfectly fitting drain plug) for the 1.5" pipe. It's more square rather than rounded and fits into the bottom of the T saddle a bit better.
I noticed from your link and pictures that you both appear to use ratchet tie downs rather than bungee cords like I did, so I'll have to put mine in the camper now that I'll have rigid ground poles.