Sorry, might be missing something, but is there a specific reason the seat maps on QR’s site aren’t sufficient?
(If it’s your hobby, have at it.)
https://www.qatarairways.com/en/fleet.html
They have 4 773 seat maps there:
https://www.qatarairways.com/content...354-seater.pdf
https://www.qatarairways.com/content...non_qsuite.pdf
https://www.qatarairways.com/content...non_qsuite.pdf
https://www.qatarairways.com/content...412-seater.pdf
I think they only just recently decked out the 789s, so it seems they don’t have the map of those up yet.