Well, it IS called the Vento, so through my excellent powers of deduction, I would assume it vents quite nicely.
It is a custom design, and when cases are customized like that, usually their mod-ability (for lack of a better term) ends right there. Expandability, I would assume is fine. The inside of it looks like your run-of-the-mill tower case that every company makes. You know, it all looks the same. Some have it made out of aluminum, some steel. It is the most common case out there, and that one is no different, other than the outside.