James, I have the Cub Cadet specific Cat-0 on my 1512, which is pretty darn close to your 782. I would assume that the 3 point from Aaron hooks up approximately the same way. There is just a flat bar that gets attached to the lift mechanism under the plate in front of the seat. I'm no mechanic, and it took me about an hour to do the install. This is the best time to replace the gasket in your rear end, since once that rock plate goes on, the rear case gets covered up. You have to replace a few bolts on the transmission, that causes you to have to drain the fluid, so this is also the best time to replace that also. With the A-Frame that Marlin mentioned, you can use all of the CC attachments that normally used a sleeve hitch. As for actual Cat-0 attachments, they exist, not real plentiful, but I know Aaron offers a York-rake, and I believe he also has a scraper blade, although I may be wrong. As for adding a tiller, the tillers and gearbox aren't hard to find, but the parts needed to attach the tiller to the tractor are VERY hard to find. I know Matt on here has made his own. The last time I actually saw one of the actual kits available, was a few years ago, and it was on that "E" auction site. Someone on this forum bought it. I would love to see Aaron start making that adaptor, as I am sure he would make a very beefy and reasonably priced alternative to trying to find one for sale elsewhere.
I have the installation guide somewhere for the CC 3 point, I'll see if I can find it.