On a typical modern glider such as a Discus or Ventus the spars slot through the fuselage and locate in the oposite wing. They are held in place with a single pin through both spars and safety clipped.
The tailplane is loctated on two lugs that operate the elevator at the rear and a spring loaded pin at the front.
All controls are automatically connected.
Tape up the gaps, DI and fly.
Simples.