Bamboo and plastic? I was more of a dacron and aluminum guy.
Bamboo ? Not on Your life !. Eppier Delta wing Aluminum struts SS wire guides possibly Bill Bennett design but not 100 % positive .
I constructed MY own from a Kit a fellow in San Diego ,CA. sold out of his garage in late 60's early 70's . He later became a distributor for a few brands and eventually sold out to another friend of mine . In turn Cecil opened a business training hang glider pilots and selling the equipment out of Solana Beach ,CA. . I had pretty well finished as I had My PPL by then .