Hey yall thanks for all the idea's.
After hearing yall say "NOOOO" to an over head design, I am thinking of doing a masonry side draft.
The reason behind building it out of brick is because I am building a masonry forge, here is a link so that you can see what it looks like at this time.
http://s1109.photobucket.com/albums/h422/kyblacksmith/
I plan on facing it with stone or brick, and I am going to put a 1/2" thick top on it, with a hole cut out of the center for the fire pot.