Whatever you can build in a design program can be printed in wallcover.
First, define the wallcover.
Is it real “wallpaper” that goes on with paste? (comes in textured vinyl, paper, and various “green” products.) This type of wallcover has seams that are cut so as not to overlap.
is it Self Adhesive vinyl (yes you can use car wrap vinyl on walls if the walls are prepped properly.) The caveat with these is the seams have to have a 1/4" to 1/2" overlap so the seams don’t split when the media shrinks over time. You will get a ridge at the overlap.
Then define your panel size and seaming scheme.
Wallcover generally comes 54" wide printable to 52 or 53" and that has to include the overlap bleed and crops at the seams.
So figure your panel width to be max 50". 40-50" is the norm to avoid too much waste.
With your seaming diagram done, NOW start your layout. You want to do everything possible to avoid cutting through text on a seam. Kern to avoid whenever possible. While seaming large letters isn’t an issue, Do NOT do large blocks of text where the seam cuts multiple lines.
Any panel over 12’ high may experience creep. A good installer will do the alignment at eye level but you may get a slight misalignment of elements at the top. The machines are getting really good at not having this happen these days, but it is something to be aware of.
Bleed is generally 2" to 4" all around. Ask your installer what they want. Some want one side or the other cut right to the starting edge, with no bleed. Also ask your installer how much overlap they want on the seams so you can relay that to the printer, if the printer is not the installer.
Do not forget your bleeds.