Mark,
You're about to leave the safety of the Fine Art Printing World!
With "murals", do you mean wallpapers, tiles of wallpaper?
I just finished printed images for four hotel rooms, each with three panels. With a total printed area of 730 sqf,
34 tiles, each 90" high at different widths. I used a non-woven wallpaper, 170gms, 36" wide. PVC-free and no glass fibre.
There's two major techniques with wallpapers; edge-to-edge or overlay. The most precise is the edge-to-edge, but also the most
difficult to print, or more; to prepare the files in the right way. You do the overlay-method when printing on thin, 90gms Billboard Blueback paper.
Edge-to-edge
should work to print borderless tiles, but with lengths at 90-100 " it works sometimes. If the printer skew the paper just a hair thin,
it goes in the garbage
I send my tiles to a mounting studio and let them cut through two tiles together, because the prints are 1 inch wider then the final tile.
Good Luck !
/Sven