Made my head hurt so I printed it off and cut it to match. I get about 1.24m of matching drop.
I really needed the full 1.6m which would go down to just above the top of the bench (it will be paneled below). The 1.24 stops midway between the light switch and the bench so I don't know whether it will look too odd.
they do normally say use 2 rolls & cut alternate lengths but I can understand wanting to limit costs, what about a lower plain colored panel with a Dado rail (or mini roll) using the green backdrop as colour ?
Another alternative would be on demand printing. They tend to be the whole wall (you give them the dimensions and image).
I have only hung that stuff once.
It was paste the wall paper. The wall was about 4m. In your scenario, you are looking at two drops per roll (traditionally you would expect 3 drops per roll).
The customer sourced the paper , there was only about 3" play at either end though. From memory the paper was about £400/500 for the wall. Not far off your prices though.
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