FINALLY got around to doing a water test this weekend and am happy to report that everything works as it should. The burners worked very quickly to bring 5-6 gallons of water up to ~170 degF, and then I was able to use the pump to transfer water between the HLT, mash tun, and boil kettle. The pump took a little getting used to, but as long as its primed it can move liquid pretty fast. As I expected, the paint didn't hold up too well, but I'm not too worried about that.
I did find that I need to buy one more camlock for the output from the plate chiller; I'll make sure to put an order in soon so I can get the first batch going. If all goes well, perhaps I'll try to bring it to the big brew day if we end up doing it at Maumee Bay.