After struggling with rudder and attempting to see if I am able to rivet it all I finally gave up and decided to leave it one side opened. Canadian aircraft inspection (Transport Canada) requires that inspector should have access to all shop heads of rivets so I must leave rudder with one side opened (on clicos). I started to work on my horizontal stab now. It is actually a long process – the part is large and assembly of it looks more like a wings assembly (I have not assembled my wings yet but read about it in manual). Today I was able to do first steps and assemble my rear spar.