1st, why are you wasting your time on 1st level characters when you are epic level? The first level characters are negligible, when you can do the things you do on epic level. Even an army of them is trivial stuff.
2nd. Why are the warforged fighters and not warblades or crusaders? Both can have a bunch of stuff that buff eachother, and thus helps the army much more than an extra feat.
3rd, Minor Creation, as noted by Garryl, is ace in an army of warforged, as lycanthromancer said, overchannel + Linked Power is the way to get it out fast but it doesn't matter, just have one out of like, 50 warforged be a shaper that can create poisons, that will last for one hour and make them all re-coat their weapons every hour.
Also, remember to set up traps that can repair them, that they can carry with them.
JaronK is right by the way, they will betray you and attack you, DMs love using your own work against you, so set up a contingency (not the spell) system for this occasion. Explosive runes is one way to go.
By the way, wouldn't a few Diplomancers be good as well?