If I knew how to load pictures properly, I would scan the course plan of Prince's from the 1932 Open Championship progamme, and post it here, just to reinforce Sean's point: in like vein I also have somewhere, or had, some photos of pre-war Prince's from the Oxford-Cambridge match of 1937, in which my uncle Neill was a participant. It does look fabulous, and the oft-repeated statement that 'Prince's was flattened during the war' looks pretty much true.
Agree with Sean completely re Huntercombe, even though the trees and associated undergrowth are now coming down at a considerable rate. Also agree with Thomas Dai re pre-war Saunton (West, especially), and pre-motorway Swansea Bay, when the latter was arguably the premier club in Glamorgan apart from Porthcawl (with whom I think it shares part of a clubhouse...).
With modern technology, I think that Harlech could now make a go of the 2-3 experimental holes opened (very briefly) during the 1920s, in the big sand dunes south of the 16th (you can make out one of these old fairways very easily from the 16th fairway), but given up before the 1926 Ladies' Championship because of blown sand. That could be fabulous, and please those like Tom D who want to see more use made of the duneland than the present layout manifests.
Above all, though, I would like to restore to life the Royal Isle of Wight Golf Club, Bembridge. Friends in the golf history world have hit shots in the dunes on the Duver, as it called, and you can even stay in the old clubhouse, but to me anyway this 'engaging cats'-cradle' of a seaside links remains, along with Bramshot and Addington (New), the greatest NLE in England, not least because Worlington would still have a genuine rival for the accolade of 'Best Nine-Hole Course' if Bembridge could be brought back to life. Albeit for a maximum of about fifty players a day!