Besides the owner's manual, and there any good wiring diagrams of the Beneteau 423 which allow for revisions on the basic diagram?

We recently purchased a Beneteau Cyclades 50 / Moorings 51.5 as it left the Moorings fleet. A copy of the owners manual and good wiring and plumbing diagrams would be helpful as we familiarize ourselves with the boat and as we make improvements. At one point, I believe this was available on...

I have a couple of mid-sized sailboats to renovate and want to plan wiring and plumbing before I start. Also, when I sell one of these boats, I want to turn a set of diagrams over to the new owner. Any recommendations for free or reasonably-priced software (Windows 7 operating system)? The...