Now the top block is CA'd to the rest of the fin assembly.
I had already tapered my rudder and hinged it to my fin. I reinserted the assembly and sanded the top block to match the airfoiled shape of the fin and rudder.
Note that the rudder of my assembly fits flush against the fin and remains straight, as the bevel at the LE of the rudder has yet to be sanded. This bevel will be sanded last.