Javan, your initial ideas for a multiple tuyere charcoal forge with manifold, ball valves, and box bellows bellow forge sounds exactly like i am invisioning for the forge i want to make. I may just go for it myself and i'll check back in once i have enough experience with it; if anyone is even still interested (I'm noticing now how old this post is...)
Unless you experimented with this design already and could spare me any mistakes.
by the way It's nice to hear I'm not the only one out there with seemingly crazy forge design ideas.
jake