YEA! Another Lang 36 owner on the forum. Congrats
I don't know about the dry ice and all that stuff, seems like a bit overkill. Use the Lang for smoking and build a cheap cold smoker, Remember all you need is a cardboard box, some wood dust an a hot plate or soldering iron. Maybe a very small fire in the firebox similar to what you do in the cardboard box but I would think the reverse flow plate would work against you. Oh well, another member to try stuff and see if it works.
I have a smoke house so I will leave it up to you to try the cold smoke in the Lang, just let me know how it works so we can share it with whoever else is trying to make the decision. Looks like Ben is bending (get it) over backwards for you. A fold down prep table is a great idea, would take less space in the garage.