We have installed wallpaper behind glass splash backs on many occasions without any problems, the glass usually being attached by a thin beading of clear silicon applied around the inside perimeter of he glass, then fitted the day after the wallpaper install. MOST importantly the INSIDE of the glass be kept perfectly clean on install as even fingerprints will stand out

I see wallpapered ceilings a bit in photos. See example. I can't imagine that would be easy to do! An application I did like was wallpaper between dark painted rafters. It was really effective. I don't envy the person who had to do that job. Or anyone who wants to remove it later. In my previous home, every room had been wallpapered sometime in the 80's. All bedrooms, hallway, living room, kitchen, bathroom, toilet. Quite a process to remove! I don't mind wallpaper but I didn't like the ones in that home. I think wallpaper can work really well in homes with a grander scale. High ceilings, architectural trims etc. In smaller homes, a restrained use is more appropriate IMO.

Love the steam punk vibe. Always check in with the artist prior to using their art as most times they would be flattered to have someone hang it on their wall especially a giant sized version. Pity you couldn't have a pulley system? mural where if that background got a bit old you could change it up with a new steampunk art piece and design the pulley to have cogs not only for function but for aesthetics as well. Have a big brass button with "Push here" to activate.

i hate to say it but i think receiving replacement wallpaper is probably the best that you can hope for as most products i've bought have warnings to make sure that the correct item is received before they're installed ... we've been caught making the same mistake with a product purchased from an Australian based company as labour is not usually part of the product that is guaranteed by the manufacturer and we were advised that the cost of attempting to sue for compensation from the tradespeople who made the mistake installing the wrong product was more than the cost of the extra labour...