As far as I can see the most likely answer to this is going to involve rotating the pitch. If they can rake the lower tiers of both the East and West Stands and lower the pitch by several yards, most of the existing East and West Stands could become the ends of the ground with the capacity retained. If the rotated pitch was placed on the northern edge of the current pitch these might be space to build a new Matthew Harding Stand that extends back across the railway and wipes out the health club. The Shed side of the pitch would then be much further forward, so there would also be space on that side for a full stand. Lowering the pitch level allows the new stands to be taller without going much higher. Keeping the East and West facilities intact, if possible, also seems to make sense, and the hotel can stay. Only the health center gets wiped, and you'd figure they could find space to replace that in the new buildings. It seems to me that it's either do something like this, or it's take everything down and start again.