The thumper is probably irrelevant for solvent recovery…but would allow you to make your own solvent.
I have found copper to be too reactive for recovering solvent off cannabinoids, and that vevor is using it in a couple of places. I would avoid using it long term.
See:Do large scale Ethanol Extractors use copper condensers or just stainless steel?
Yes, it also gives you the ability to burn your product. A baine marie obviates that risk
Direct heating generally wont go bang till the heating element is uncovered and reaches the auto-ignition temp of ethanol (350C or so), but that can happen quickly, and if there is still ethanol below the element when it happens, yes, it will make fire.
That vevor does not have a heat source, and could easily be run in a large pot of water rather than on a heat source.