Oh no, the vent idea still stands, just redesigning the manifold a bit to be able to incorporate more of a natural pool look in the tank (at least that is what I am aiming for). A burl would be a great idea on that vent, unfortunately, that would mean another long trip to my not so local LFS.
Tom barr normally has some nice burls. Check with him or woodcraft.com. they normally have decent burls.