For those looking to get into FAI-style rocket contest, there are some kits available.
If you search Aeromaster (Shady Liu) on facebook you can find some exquisite air frames. Also for gliders search Oleksander Ro-Models.
Apogee sells a lot of kits and parts https://www.apogeerockets.com/Model-Rocket-Kits/FAI-Competition-Kits
Galactic Manufacturing sells them as well. https://galacticmanufacturing.com/