Sorry, I'm not familiar with the 46, but it's mentioned (without a lot of detail) on the Defever Cruisers website. DeFever Designs: DeFever Cruisers - A Club for Yachting Enthusiasts with a Passion for DeFever Vessels and the Cruising Life!
Before we bought, we joined this owners' group and lurked on their forum. Several very experienced owners post regularly that your friend could consult. If your friend is anywhere near North Palm Beach, they're having the annual Defever rendezvous there March 20-23 and you don't have to own to attend.
Finally, I'd give Curtis Stokes a call. He's a very knowledgeable broker who specializes in Defevers . . . and zero pressure.