When I was a nipper I had a Saturday job at proper old fishmonger. My first job of the day was always to collect a couple of brace of pheasant that had been chucked over the back gate into the yard by a mysterious stranger. Second job was to light the smokehouses for the kippers. I'm not trying to give advice but just to point out that these were just basic ply sheds about coffin size for want of an easier comparison. Sawdust and shaving (oak) from a local joiners firm. Occasionally a cup of water.
Put it this way, I didn't struggle for a seat on the bus home.
I know it's not cold smoking as such, my point being that you could probably cobble it together with scrap for pennies. Old car wheel, garden burner bin, bit of ply. You might not want to mind you lol but racking and hooks very easy to manage with a wooden frame.
If we're talking favourites, smoked duck breast is sublime thin sliced with a nice glass of wine and some hard Italian cheese. Chuck in some air dried ham and... Hold on I'm just popping to the kitchen...