The Somethin' Extra is also known as the SSE (for RCUsearching). Probably has the most build threads of any specific plane on RCU. It is truly a giggles-n-grins plane that at high rates has a roll rate well over 720 degrees a second and enough elevator authority to loop darn near in its own length. Put a big chunk of aluminum on the nose and it will give you unlimited vertical. Know also that the SIG designer & prototype builder is still flying his original prototype (or at least that's what I remember him saying).

Pilot experience: intermediate
Builder experience: beginner

Great 1st build too.