Try searching the threads. There are three sites with "tutorials".
One is www.janchan.com
and she has a pattern scanned from a Cosmode. Used to be www.bakachan.com
, but she changed it.
Amethyst Angel used the pattern, modified it, and made it out of styrene and foam and posted her tutorial (try searching for her member name, then go to her website; it's also been linked in the FMA cosplay thread (possibly page 2 or 3 by now of the anime forum). You should be able to find her page by searching google.
Third is by Katasha and R. from another forum. It's been linked in the props and accessories forum. Try searching *automail* and see what comes up. It's the most difficult and most costly, using resin casting and the like.
Oh, to search: Click on the forum you want, then look up by the page numbers/post number in the purple bar. Should be a "search this forum". Go ahead and type in your words (must me 4 or more letters long). To search a thread, click on the thread, then look in the same place, and see "search this thread". Easy Peasy.
(Or, I just realized, hit the link in my sig to the FMA Military uniform page, and look under the handy links - they're all there [janchan, amethyst angel, and katasha's].)