Nodal Ninja is another panorama rig to look at. Well made, well priced.
I've tried the multi-row stitch method to shoot a few facades before and it works fairly well but find it can often look a little strange, kind of like superwide distortion but more that the image has been stretched. Depends how close you are to your subject. I've done it with a 50 and 135 and the 50 works better.
I would generally prefer the same sort of method as Siobodan, shifting the ts-e along one of its diagonal axis, taking 4-5 (8-9) shots (four corners one center as an anchor) and then stitching. I do this a lot with the 24mm to get around a 27mm field of view. The 45 will probably give about a 28-30mm this way. If you rotate the lens off its horizontal shift axis by the first stop, 30degs, you'll get a slightly aspect similar to 16:10. There is also a much more natural look to the final image than the other method.
You could possibly combine the two.
Lightroom will stich files into a dng and does a decent job. It's also pretty good at getting rid of chromatics in the DNG after it's been stitched, but I did find C1 better when you import this DNG. It might not totally clear them up though if there are some heavy ones.