If it was me....id stitch 8x10 drum scanned negatives together. I've done quite a few of these with 4x5 to make 42 x 80 inch prints, (could print them larger, but that's the max of the printer). If you have a lens with enough coverage and plenty of shift its nice to just shift, but honestly I have just rotated the whole camera with great results it just takes more work in photoshop. I like to use the photo stitch function in photoshop set to stitch and blend (without warping) as a starting point, then touch up the layer masks and warp myself if necessary. Much easier to do this with natural forms where you can fudge some information, but I have done it with buildings and other man made structures as well.
Good luck!
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