Took this today with my Pentax K10d. It’s a 3-row pano with a 50mm lens, developed in darktable, exported as high quality jpegs, then stitched in xpano which did a perfect job, unlike my other option, the venerable Microsoft (shh!) Image Composite Editor which left a nasty join over the roof. Thanks, @krupkat! 
I then brought the exported file back into dt for some final tweaks.
