With emphasis very much on the "fun" in the thread title, a proof of concept...
Phase One AF, Mamiya 300mm f/2.8, IQ180. Shot at f/2.8 (107mm physical aperture). 144 separate photos stitched together with a bit of a crop afterwards. Result is a 4.4 gigapixel file, with a horizontal FoV roughly equivalent to a 22mm lens on full frame MF.
To get the same depth of field though, that lens would have to be an f/0.2.
Of course, given that this is not much more than 1% of the full size, I think a lot of the impact is missed. Here's a link to a full resolution version (requires Flash), but really I think it would need to be printed fairly large to get the full impression - it would print 28 feet wide at 300ppi:
Virtual Tour generated by Panotour