The electric version of the glider (Freya E, Freya EV) is designed to be built with an aluminum spinner (using a plastic spinner may cause you to have to put more weight on the nose of the glider).
It is recommended to use light covering foils such as Oracover Light.
The recommended glue for gluing the wings ribs is ZAP CA Thin (pink label). All other parts can be glued using any thick CA glue or any waterproof wood glue.