The tubing looks like the stainless steel flex gas hose you buy at HOME DEPOT, so permeability/durability would not be a problem. While you pump to near a full Vacuum adding fluid would reduce that to probably something like half. Partial vacuums like you see in the food industry are common and easy to maintain.
Working temperature range - Since the fluid is sub cooled it condenses at lower temps, so if ambient drops the fluid boiling temp drops proportionately from the papers I have read. should have the same performance from 60W to 200W unlike heat pipes which only work in a range.
I would think that from the hose length it mounts on the top of the box in some kind of case - Tall case the unit would sit towards the back short case at the front of the case, maybe a couple of "avg" hose lengths would cover most scenarios.
It is early in the technology cycle - the first water blocks were poor performers compared to those sold today. Looks very promising, a couple of tweaks and performace would be very cost competive to water.
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