[Zogthetroll]

actually, with regard to the resistances of various fittings, two swept 45 fittings will have less resistance than a 90 (if I remeber correctly, the resistances are added, I don't feel like dragging out my fluid mechanics book right now to check though). Check out This article on maximizing flow rates for a reference for the commonly used fittings. yeah, I totally agree about glass. If I end up putting a window in my case (something i'm still debating whether it will fit with the overall design or not) it'll definately be glass, especially since I have the tools to cut it, not to mention access to some really cool stained glass if I want to go that route.