Originally the fiberglass rudder cab is riveted but then it’s difficult to connect and change the strobe light. On the VAF forum I found out that some RV builders make the the fiberglass cabs of the wings and rudder removable with nut plates and screws.
I used KM1000-030 nut plates with AN426 rivets and RVS screws M3 x 8:
Final result:
