1) Buy your cabinet here: http://www.markertek.com/MTStore/Store.cfm?Search= oak+rack+cabinet and get a good looking fake oak veneer 19" 8U (product# OBRK8) for ~$110, black for ~$90, quality is good-very good. Ships flat, UPS ground $6 (cont US).
2) Buy rack proto boxes, same place. Search for CH-1 or CH-2 (Mid-Atlantic Products Rackmount boxes) that are about the right size for what you want to enclose. Most sizes under $50.
3) Use your drill, a jig saw, a little hot melt and fit your components in.
4) Smile at your creation.
We did just that and have an amazingly prof cabinet for very short money. We used the CH-3, a mini-ITX, and the components from an old case (for leds, switches, PS, etc and just hacked-out and drilled the mounting holes and slots in the proto cases. We also used an APC UPS and stuffed it into a 2 high unit and reposition the LED's to the front. Drilled and hardmounted the rest of the unit to the back of the box. With a little care in the metal hacking, it can come out beautiful.
Most places we looked, including the audio places, were just rude on the price for rackmount equip. Markertek is a broadcaster supply place, but (for some reason) has great prices on these particular items.