More time on that rudder join. I think it may need just a curve at the rear as well as you see in pic 1. This will work out in a similar way to one other such rudder treatment I have pics of. Nice to arrive at the same place without unthinking duplication.

Pic 2 shows that the hinges need a trim if you follow the plans sizes. Its just not mentioned in the text anywhere. I soon noticed that while I dug out foam per plans on the inside of the rudders, no way were the hinges going to fit without trimming them down. I spent all day fiddling with this and getting a nice fit. The part that sits on the rudders need a different trim to the part that will go on the winglets. Both are not just the uncut 1″ wide hinge.

I used hot glue to set up the hinges in place and some aluminum angle as my straight edge as you see in pic 3.

More edge work

Not to plans

First alignment