I worked on the rudder and fin last night. Here's a picture. It's hard to tell from the angle of the shot but I put blocks on the leading edge of the rudder.
This weekend I'll add the ribs, lightening holes, trim tab, hinge blocks, and some filler. Then I will start the sanding. Then I think I'll do some sanding, and if I have any time I think I will do some sanding.

Robart recommends 3/16" hinges for 1.20 to Giant Scale Models, so I will get those.

I'll also add short fairings to the training edge of the bottom of the fin. They will be carved out in the center to match the shape of the rudder.

Question about glassing: Did anyone leave any extra space between parts if you are planning on glassing or does the added fabric, primer, paint, etc only add very little additional size to the parts?