Tail.
Part 24 should be laminated with 1.5-2.0mm card - I chose 1.5mm.
There is no mention to sand down the edges but it's wise to do this as the horizontal stab has rather thin profile and those sharp edges might make the assembly difficult.
If you decide to do separte control surfaces, cut them off at the thick black line and discard, kit provides optional parts to replace them.
In this case, you will need to mark the line 2mm from the edge to place part 24.
Braces (parts 27) are a bit short to reach the marked spot on the stab so I just glued them where they end. Difference is about 1mm so it's unlikely that anybody would notice anyway
Vertical stablizer - separate control surfaces are provided but the spar is not. Scan the part beforehand as you will need the top part for the stab, and the entire thing for the control surface.