Nice haul, John. Great photos! Definitely a good fixer-upper, but a good solid place to start. I noticed the "mud" in the wheel treads and immediately recognized the source.
Deck looks pretty solid, and you have the assist kit too. With all the other accessories that tractor came with, you can't go wrong!
A couple of days before my latest purchase (812), my wife had been out shopping. When she found out about my latest Gravely and "started", I reminded her of her recent purchases, she said, "but it was all 30% off". I just said I spent less than you did, I got it for 40% less than asking price, and when I am done using it, I will get my money back. 'nuff said.
She really tries hard not to complain about my hobby. I'll admit to having more Gravelys than I can operate at once, and maybe a couple more than I really need, but she always knows where to find me, and they always look and run better than when they came home. And I will thin the herd, someday.