check out bike church before you start. they're open tomorrow... call ahead and see if they have something in a 48 or whatever yr size is. chances are, they will. it's quite possible that you can offer a trade for your huffy, come away with a better frame that makes more sense and end up even steven @ the wallet.
worst case scenereo, they say "we don't get many small frames", and you continue on with your build.
but trust me-- i also ride oclv carbon, and built up a bob jackson vigorelli with high end parts. i had a nishiki as my beater for close to two years now (just bought a jury chrome to replace it) and i hated riding every mile of it. the frame was super heavy from overbuilt tubing, and subsequently stiff and harsh. in the end, i simply stopped riding it and rode the more expensive bikes around town more than i should. seriously, try to avoid that frame.
but that's my piece... good luck + pics when yr done.