Thanks for posting this setxjeff!
I've lusted after a grapple or a thumb since the day I bought my tractor over a year and a half ago. Just couldn't bring myself to spend the kind of money a full grapple costs, plus didn't like the idea of having it permanently attached to the bucket.
After a couple of emails to Green Machine, I ordered the 24" model today and plan to build mounts for both my bucket and my forks. The fork frame will require some modification but the plan is to arrange things so it will bolt to either device in a few minutes.
I expect it'll get used most on the forks for handling firewood logs, but it will be nice to be able to swap it to the bucket if needed or just take it off completely.
As a cost-savings measure, I won't be adding a third function to the loader joystick (Holy COW they're expensive!) but will run hoses from the rear remote and use the separate valve in the cab.
I'll document the process and post pictures. The thumb was $467 including shipping, I should be able to get this done for under $700 including steel and hoses.