My first cab was based on Lucid's design, I built this around 15 years ago. It was lovingly used for many a party but I finally sold it to a friend of mine a couple months ago. At this time I was building a mini cab for my daughter and once finished I decided to work on a newer much more theater room friendly cabinet. So I started looking around here and stumbled across this
http://forum.arcadecontrols.com/index.php/topic,104851.msg1109316.html#msg1109316 from TTA games. Loved the design, so I took the idea and basic look and decided to build a similar cab. I have many more pictures at home that I'll upload about the build process but to start off here are a couple.
So far I have way too much money involved, because that's how I roll. The internal edge is a 45 degree chamfer and the outer panel will have a roundover, I plan on theming it clockwork/steampunk style. Long way to go but I'm getting there.
For the sound system I'm using some old car amps I have along with 8 2 inch full range speakers and 1 10" sub. The sub box is placed in the back on drawer slides for easy access and all of the back panels are mounted with bolts and nut inserts so I can access any area of the machine once complete. Once I get into the guts and past the woodworking stage I'll explain all in more detail. I figure this will be my 'showcase' cab and I doubt I build another one unless I just get the bug in another decade or so.....
Anyway here are the latest pics, I'll add some older pics later. Notice the home made dolly I made, I got tired of calling someone out to the garage to help me move it around...
Here's what I've bought so far, not including the wood, hardware and couple new tools i just HAD to buy to do this

1 x I-PAC Ultimate I/O Interface with full wiring harness.
Cable Type: 4.8mm switch connectors (for all except Goldleaf buttons)
1 x J-Stik Ball-Top
Color: Red Ball Top
2 x Joystick Mounting Kits
Type: 5mm for all other joysticks
1 x Optional Trim Bezel for U-Trak
1 x PCB Mounting Feet
2 x RGB Illuminated Handle for Servostik, J-Stik
1 x ServoStik
Color: Red Ball Top
1 x ServoStik Control Board
1 x U-TRAK FlushMount Arcade Trackball.
Color: U-Trak Pearl
1 x U-Trak RGB LED Illumination Kit
18 x Ultralux Translucent Illuminated Pushbuttons. Includes LED.
Color: RGB White with 500mm wiring
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Total around $550
HP Zr30w 30" 16:10 monitor - $320
8 of these
http://www.parts-express.com/hiwave-bmr12-compact-2-full-range-square-speaker-12w-8-ohm--299-208 These little guys put out a decent sound for the size and play down to 150hz which allows me to get away with just a 10 inch sub for the low end. I plan on wiring 4 for each channel, to get to a nice 2 ohm load on the amp.
2 old car amps 1 old 10" JL Audio Sub - free cause I'm a packrat that doesn't throw away much
The other costs will be glass for the marquee and bezel, vinyl graphics for the theme, and of course pc parts and various fans, I'll update this list as I buy stuff.