I would have boxes on the outside of the pan with the drawoffs comin out of them.I dont see a big problem with the valves being on the sides of the boxes as long as they are low towards the bottom but mine are coming out of the bottom.The boxes will also be where you can connect the pans together once you get a new pan.That is how my flue pan connects to my syrup pan.Also if the isolation doors you are talking about are so the 2 end sections can close when trying to bring the temp up i would keep them one reason is so that when you are all done the more concentrated sap(almost syrup) will not mix throughout the pan and reason number two is so if you are having trouble bringing the syrup up to temp you can close the door and boil the last bit of water out so you can draw syrup off does this make sense?
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