The top rib consists of two halves that need to be shaped around the ruudder post and then trimmed at the leading and trailing edge to fit around the shape of the rudder trailing edge. The rudder trailing edge is provided pre shaped but oversized so you need to trim once you have applied your first temporary cleco fit.
Paul advised to start at top rib first and work down. Cutting through the top rib halves made me feel it would weaken this piece too much as it has to fit snugly to the rudder post. Far from it .. once cleco’d it is incredibly stiff and looks like it could take great force !
Once sure it is still looking square with body, you can start to temporarily fit the other two ribs in place
Starting to look like a real aeroplane !
As each rib is shaped and secured (with clecos initially) the rudder trailing edge will finally be trimmed at the bottom of the rudder post where it sits in a 13mm hole right through rudder post.