Sorry mate you have lost me!
Just caught up with this thread....
By my sums repeating the South Stand build in the North Stand will add an additional 6,200 seats - new block number capacity would be as follows:-
332 - 600 seats
333 - 600 seats
334 - 600 seats
335 - 569 seats
336 - 732 seats
337 - 732 seats
338 - 569 seats
339 - 600 seats
340 - 600 seats
341 - 600 seats
So that would give us a usable capacity of 60,700'ish
Which means we're looking for another another 2,300 seats to get to 63,000...
The bottom row of North Stand Tier 3, if built in the style of the South Stand (without segregation and extra steps for Legend Lounge types) would be 224 seats. It is reasonable to assume that any in-fill seat rows would be the same capacity.
So if we slot in seven rows (about right) in the vertical space where the Boxes are now above Tier 2 in the North Stand, we adds a potential 1,568 further seats. Then add in the two small extensions to the north end of the East and West Stand 3rd Tiers (as per south end) adds about 130 seats in each corner so we get to 62,528... close but not 63,000. But don't forget we need to knock off the lost box space which I think is 14 boxes of 10 seats each, so 140. So we're down to 62,388. But... we need to consider the lost NE and NW Corner seats, of which there is (I think) about 75 seats in each, so you end up with a total of 62,388 - 150 = 62,238 - 762 short of the 63,000 figure without exercising some jigger pokery around to find another 191 seats in each of the four difficult open corners where the big screens are now and will end up...
NOTE1 - all of the above assumes the back few rows will still be able to slide in without fouling the existing cable net towers and tie ins
NOTE2 - someone asked for a mockup - did this in June
Alongside a Spurs/Dortmund wall version...
Compare with South Stand build today