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Proud owner of a Sentry 2.0 of a Navy Gray variety here. I adore it. In my humble opinion, dimension-wise the Sentry is close to perfect. I would like it to be 5L in volume like NFC's S4M, but that would mean omitting a standard SFX PSU, which would go against one of the core principles of this case, i.e. the ability to stuff in conventional parts from your local PC store, not some custom made hardware (looking at you, HDPLEX power supplies, of which I have three, two of them dead and the third one works with some issues). Still a fan of S4M, though, but you absolutely can't deny the user-friendliness of the Sentry. Hard to say what a third version should be like... It's easy to give ideas without proper examination of what gets into making such a case. There are many variables, I believe, many behind-the-scenes stuff we don't know about. Sure, we want this and that, but it ain't that simple. Me personally, I would leave the dimensions as it is (or make the case even smaller if it doesn't mean loosing the ability to put in an SFX power supply). One thing I would surely work on is the looks. Not that it doesn't look great. Quite the contrary, as a matter of fact. But from 1.1 to 2.0 there wasn't much of a change in terms of aesthetics, and I believe the 3.0 should be even more good looking and be a little different.