there's a lot of room on the centenary stand side to play with, 25m. the main stand has about 10m. 2metres if they want to keep the carpark lmoa.
now, that is a thought.. pull back the centenary 20m, drag over the kop and anfield road, pull over the mainstand and there's your new space to work on the new stand without having to knock down the houses behind, leave the shankly gates as they are and the memorial..
i reckon that will work. relocate the centenary stand in year one, complete rebuild. 20 metres should create 12 rows of seats (some 4000+ seats). rebuild the kop in year 2 (1994 rebuild took from may to december, partial crowd from august to december) - span it out a little to blend in on edges with new centenary and new main stand (approx 1000 seats), rebuild new stand year 3 (4000 seats), year 4 anfield rd rebuild (2000 seats) extra 11,000 seats and only moved 20metres 56,000 capacity
but, there's always a but... if the centenary has room for manoueverabilty, it doesn't mean there is room down at the kop end/kemlyn road junction onto breck road...
i don't know if there is already a thread exploring this angle, so apologies if there is