Thats a very nice pit you've got. TuscaloosaQ does have the separate exhausts on the cook chamber and the warmer.
TuscaloosaQ can pretty much make the smoker the customer wants. He can size it to whatever the need is. He is very accommodating and easy to work with.
TuscaloosaQ puts a baffle from the main cook chamber to the vertical warmer. That way you get live some in the warmer. He can also put in a vent in the bottom of the warmer to add more heat from the firebox to the warmer if desired. He also has a charcoal basket in the warmer if you want to use only the warmer without firing up the main chamber. You can grill in it over the charcoal or use it as a separate smoker.