There's something screwy here. The are two configuration maps that are closest to that shown in ITN and they both have the same layout for WHY.

These Qantas Seat Map(s) have WHY at rows 34-41, 46-56 & 58-75.

When I check the seat layout as previously suggested, it shows as goodo wrote. By this I mean WHY is shoing as rows 34-41, 46, 53-56 & 58-75. i.e. Rows 47-52 are not showing; this would normally indicate row 53 as a bulkhead/exit row.

The actual WHY bulkhead seats on the 3 class configuration schedule to fly that day are: 34A-B-C-D-E-F-G, 47D-E-F-G & 63D-E-F-G. Exit rows are 46A-B-C, 46H-J-K, 58A-B-C & 58H-J-K.

I would suggest that you recheck with whoever allocated the seat for you. Also, as a tall guy, bulkhead seats are not always these answer; I would try for an exit row (avoid A & K seats unless you want a liferaft as a footrest).