Okay, I finally managed to get the windows ordered. With tax, just shy of $5000. I also wrangled my way over to Home Despot to pick up the hardiboard, which is a fibercement product that is designed to be a backer for tile and such-- in this case, it's going to be the backer for the stone veneer. It's heavy, but it's solid and waterproof and totally flat.
I still have to unload it from the 'Sploder. 40 lbs per sheet, 25 sheets. And it has to go around to the front, so joy awaits me outside. I've already had to load it onto the 'Sploder, go I get my workout for the day.