In the garden I have an old, and stunningly heavy, old Ideal boiler. It's
something along the lines of this...
http://www.hevac-heritage.org/items_of_interest/heating/national_trust_properties/killerton_house/Dcp_1994.jpg

....but more square and not so old.

I would like to turn it into a hot smoker but I can't think of anything
which I could molish a good smoke box out of to fit onto the 6" stub of
chimney the boiler has on it.

I imagine some sort of metal cube with a lid would be suitable but I can't
think of anything except bikky tins and they seem a bit floppy.

Any ideas?

Si