You might look at the design here
http://blurbco.com/~gork/mamecab , and see if thats something that looks good to you. My friends and I built these for our entertainment pleasure. We have built about 3 total. If you like it, I can send you the specs to build them. Remember, we're not woodsmen or carpenters, and ours came out fine, as long as you go slowly and check your work.
The picture on that page is our end result, but there are concept and build pictures on the site.