Your problem here is that the hinges haven't been properly installed. Those "paper strips" are called CA hinges. They are designed to be glued to the structure using thin CA adhesive. RCU member Minnflyer has done an excellent "how-to" on installing CA hinges. You can find there in the RCU Magazine here: [link]http://www.rcuniverse.com/magazine/article_display.cfm?article_id=55[/link]

Hope this helps

Ken