Hi everyone! I'm working on building a temporary darkroom in our bathroom upstairs, and since I still live with my parents it needs to be just that, temporary. That is, able to be set up and taken down in a moments notice. I am having trouble blocking out ALL the light form the window, its about 3x4 about. I build a cardboard insert, works well execpt for the corners. Does anyone have a cheaper way, something not as bulky as a huge insert (ie, sometihng that fits together or something?) that works. I also need to put in a light tight vent, made of cardboard perhaps, for incoming air. The bath has a fan to take air out. Any ideas on how to build one, I don't want to buy on because they are kind of pricy. THANKS!