Last night I finished up the key and got the pulley mounted on the motor. I also got the motor mount welded up fully, slotted, and its ready for install.
All I'm really waiting for now is the belt I ordered. I'll probably get that sometime next week.
I was going to start wiring things up, but I don't think that I'll do that because I still want to do the testing before the full install.
Lastly, the printed water pump pulley has been holding up great to the heat since its installation. Of course, it hasn't been under any load, so that'll add more stress to it. Time will tell if it holds up.