I'm also looking at modelling the same area and have found it difficult to find information, especially photos of the mid-sixties era. One book that maybe useful is 'A History of the Hull and Scarborough Railway', I can't remember whether it contained scale diagrams of the station or not, but there are quite a few useful books available from Beverley library, and if they don't have it there, if it's at another local library, you can order it through the East Riding CC website and get it sent to another library, a really cheap way of getting useful information without having to spend lot of money, some of the books also have track diagrams as well.
I know that Mick has many useful and excellent photos of Beverley, especially from Cherry Tree lane end but I'm not sure if he has any from further north. I'm also looking for more photos from the goods yard and cattle dock at Beverley, but without much look,
Andy