Thanks for the photos and drawing CW. It's becoming a bit clearer now that I've read through your description a couple of times! Sounds like a simple solution. From what I can find it seems having the pivot at the correct spot in the stab is the most critical thing. How many degrees of travel are you using? From the slot in the fuse, it looks like about 10ish total.

I mentioned using an Insite as an entry level airframe. I should also say it will not be in a 2X2 size. I'm thinking about a 65ish inch wingspan 'cause that's the equipment I have on hand. This will get me started and if I like it will move up in a year or so.

Ken