At one time I was dumb enough to make postcards with my 44" printer. I had a "master page" with 2 pixel "tick marks" around the horizontal and vertical edges. The "Snap" was set up so I could very quickly simply drop properly sized images into the snap grid. Used a 2" wide x 48" Alvin stainless steel cutter to slice them up on a cutting matte. With a little technique it was easy and the cuts accurate enough for a true bleed look. Hint...don't cut all the way to the edges, use that extra 1" border all around to keep the whole thing cohesive, even as you start to lift out prints when you start to do the slices at 90 degrees to the first ones.
There was company a few years ago that specialized in cutting exotic fine art media into 8, 10, 13, etc inch rolls. Bought my 7800 from them. I guess they're gone now.