I approve of this idea. The guy in the trading house will already buy your wagon wheels, and crates, I'd say coffins are a popular item in Barovia too. The only arguments against it that I can see is that you -might- get that random drunk troll who just goes around setting up coffins everywhere and also that it would have to be an intermediate recipe that would require much more scripting work than it would get use out of.
I don't know how much work would be involved in allowing PC's to make placeables (stool and chair) that you can use like the eisel, birdcage, and hukkahs, but that would be pretty swag to create and something I can imagine myself making a lot of.