http://www.nextcraft.com/foamwingsandparts.html
Wing tubes: https://www.youtube.com/watch?v=JuiaXxrvAqg&ab_channel=MikeNCRCF
Aluminum wing tube is better than carbon fiber (although carbon fiber is lighter): https://www.rcuniverse.com/forum/rc-jets-120/11659702-preferred-wing-tube-sleeve.html