This blog post
by John Eaves covers the evolution in quite some detail. No decks were intentionally added and the conceptual size changed only from 2248 to 2250 feet over the years.
If someone could create an overlay of the various schematics, including the Fact Files orthos and the freely available Nemesis CG views, it should be easy to see how the proportions changed over time. In order to develop accurate deck plans, it would be necessary to decide which of the versions is 2248 feet long and how many of them can be rationalized as in-universe modifications.