Here's a nice overview of the inside of the P160. A couple of things jump out immediately. One is the internal 3.5" drive bays, which face toward the side of the case rather than the front. Another is the Molex connector mounted above those drive bays, which looks to supply power to the aforementioned LEDs in the front bezel.
These are the connectors for the Firewire and audio ports we saw on the front bezel. The USB ports use a keyed, ten-connector plug, which has become somewhat of a standard among USB port connectors. Firewire, however has no such standard, so instead you get a bunch of (labeled) single-pin connectors, and it's up to you to match them to the correct pins on the Firewire header on your motherboard. Ditto for the microphone and headphone connectors.
This arrangement, of course, assumes you have the proper headers on your motherboard to utilize these connectors. Obviously, if your motherboard doesn't come with a Firewire header, or if you're using a sound card that doesn't have headers for the microphone and headphone signals, you'll be unable to use these ports on the P160.
These are the thermistors for the temperature display on the top of the front bezel. There are two of them, and system builders can mount them wherever they choose inside the case. In operation, the display cycles between the values produced by two thermistors, with a small LED indicating which one's temperature is being displayed. A microswitch inside the case toggles between Celsius and Fahrenheit, and power for the temperature sensors comes from a Molex connector (with pass-through) attached to the inside of the top cover.
Here's a close-up of one of the internal 3.5" drive trays. The drive trays can be removed by squeezing in on the spring-loaded clips and pulling straight out. Note the rubber grommets on the bottom of the tray. Special screws included with the P160 come up through these grommets and screw into mounting holes on the bottom of the hard drives. The grommets isolate the drive, keeping its vibrations from being transmitted to the rest of the case.
Directly to the right of the drive trays is a thumbscrew that holds the front fan mount in place. Like the mount on the rear, this one fits a 120mm fan. Only one fan is included with the P160, however, so if you want to mount one here you'll have to purchase it separately. The fan mount slides into place directly behind the front bezel's air filter.
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