Checked the mainboard again. It provides 4 backside USB connectors, plus an USB header that you can use for the 2 front side connectors in the case. Total is 6 USB connectors, which should be enough.

There's also a Firewire backside connector, plus a Firewire header. The case has a frontside Firewire connector, so you'll have 2 Firewire connectors.

As far as I can see, case and mainboard are well matched. The type and number of the front side connectors match nicely with the type and number of headers on the mainboard.

It's not surprising that the case has only 2 connectors on the front side, and none on the backside. The connectors on the backside are grouped in a fairly small area covered by a thin metal plate, the so-called backplate. The backplate comes with the mainboard, since the layout of the connectors varies per mainboard. Some have 2 ethernet ports, others have only one. Some mainboards have a COM port and a parallel port, others don't. 
The outer dimensions of the backplate are standardized and will fit in any standard computer case.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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