Very nice Jan ... looks to be fairly low mileage for age. The cylinder assembly looks a bit like ones seen on ADE engines, so I wonder about any relationship possibilities there. Also, Id say that drilling two holes overlapping is a bit of a PITA and quite time consuming, so I wonder if those firebox holes might not be stamped out/knocks out like in an electrical box.
I must add that the burner looks just like the tins that fillet of anchovies comes in here!