MAME Cabinets

I found these sites an absolute neccessity before you start building or planning your cabinet.

Build Your Own Arcade Controls - The Bible for building arcade cabinets.
Jakobud.com - Many original cabinet plans.
LuSiD's Arcade Flashback - Well detailed cabinet plans - from what I can tell probably the most copied plans out there.
Ultimarc - Great place to purchase keyboard controller and buttons.
Happ Controls - Great place for hard to find arcade parts.
Hyperspin.games - Hyperspin Hard Drives and many other System Roms Games.

One thing I would like to help out with is all of the dead links on Build Your Own Arcade Controls, not that it is their fault. It's just that a lot of people's arcade sites go down after a couple years. To help remedy this problem I have no problem donating space up on my site for anyone that is interested. If you want to document the construction of your cabinet, but need someone to host the pages for you then contact me and I can probably help you out.

Hosted Cabinets

Capper's Mame Cabinet