After varnishing the interior of the fuselage I started working on the top skin of the fuselage. When I was following the plans and the advice of prior builders I decided to skin the bottom of the fuselage before the top. This way when I applied the varnish it would run down and seal the gaps and cracks in the bottom vs the top. This makes sense as the condensation after build would also run down in the bottom of the fuselage. So when I progressed to the next step and built the rudder supports I put the top frame of the rudder in place and forgot the top skin was not installed. Today I removed the rudder support and next week I will rebuild.