These pictures illustrate the straight forward method of construction, the tubes are assembled into panels with gussets. The airframe is built of aluminum tubing with aluminum gussets and brackets at the joints, fastened together with bolts and rivets.
The panels are then bolted and riveted together to form the airframe!
Back.
The stabs and elevaters ready for covering.
The tail section ready for covering.
view of cabin section with the wings installed.