After getting the motherboard and power supply in place, the rest of the components just kind of worked themselves out. This is just a test run (since I have to still cut the hole for the volume knob) but I will use some velcro to secure the speakers in place behind the speaker grill and I wired the power button to the pins on the motherboard (temporarily since it will ultimately be installed in the back panel).
This is a shot of the speaker bar in place from the bottom. You can get a good look here at the support for the shelf as well as the computer fan mounted underneath.
This last shot basically shows what the thing will look like from the front (if you can imagine the protective paper on the Plexiglas peeled off and the marquee in place). The speaker grill is installed and matches the vent on the back as well as the chrome colored t-molding and volume knob.
It looks pretty good!