What i tried to do yesterday was superimpose the old photo over a street view photo of Holt Hill and get some idea of scale and size, it was a bugger to line up, perhaps someone with the ability and tools to do it can have a go. I can't find the height of the Ark Royal but it looks as if it would tower above the present day construction hall which is 107m high, 351 feet in old money.
Not quite sure about your figures there Bert. I know the Cammell Laird website says the Construction Hall is 145m(L)x107m(H)x50m(W), but this is clearly a typo: it should read 145m(L)x107m(W)x50m(H)! The height is actually 50 metres, about 164 feet in old money. For comparison, the height of the Ark Royal from baseline (ie bottom of keel) to flightdeck was, based on my measurement of a set of plans, 87 feet 4 inches (about 26.5m for you youngsters out there); given that the ways she was sitting on were about 5 feet high, that would give a total overall height at launch of about 92 feet (just over 28m).