Probably the easiest thing to do would be draw out the sections of wall on square-lined paper (connecting the sections that join each other) and then see how many to-scale 53x53cm squares you need to cover the whole thing properly.
Or do it in sketchup. I once repaired a wood floor that way, had a big hole in the floor and a load of planks that had come out of it. Worked it out like a jigsaw in cad and then did it IRL.
Which bits of wall connect to which other bits?
Probably the easiest thing to do would be draw out the sections of wall on square-lined paper (connecting the sections that join each other) and then see how many to-scale 53x53cm squares you need to cover the whole thing properly.