Velux VS 606 44-1/4" x 46-1/4" used, 10 years old $350.00 for 3. They have no flashing, but do have blinds. Should I buy them ? The roof that I want to put them on does not slope much, about 3' pitch in 16'. The roof joists are 24" on center. The roof covering is rolled roofing, fairly recent. I need some natural light in this room for my birds. It is on the North side, so wall windows won't help. Is this doable ? HELP ! Thanks, Tom