Ok - here's my version. Just make sure that the fill point is a good cap that can be taken off to fill/drain, and than when screwed on is air/water tight. The only thing you should have to worry about is the air bubble in the res getting into a tube if the system is laying on it's side/upside down when moving it to a LAN party or something.
Most of this is based on the theory that if you put an upside-down cup in water, the air is trapped in the cup - it doesn't magically find it's way to the top of the system (in this case bubble back up above the water). So - air trapped in the tall part of the res will stay trapped so long as the res stays with that side up. Since the water will be moving the slowest through the res that is where the bubbles in the water will separate from the flow and gather at the top of the res. Having an angled res roof makes it much nicer (all the bubbles will collect in one point) but is not required so long as you keep everything submerged.
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