Lovely model John,
Like the idea of the 'view' down the hatch, also that sheeting system on the mizzen is a good idea that should avoid the tangling around the rudder head as mine does !
As the rudder is unbalanced, I decided to make my perspex extension have a small area forward of the pivot, thereby making it a balanced rudder. Might be worrying over nothing but I didn't want to find out the hard way ! You can barely make it out on the pic, I have a close up on my other computer somewhere if you are interested
regards
Mike