I went through Cdk awhile back (5 years ago now? wow), as I thought I would need it at the time for a "fun" project I was working on; it appeared even then that the author had abandoned it, as I wasn't able to get any response in trying to track him down with a couple minor patches.

Other actually-important things intervened and I never got back to it, and definitely didn't have any reason for taking it over for just something I was fiddling around with. I may be able to track that old code down; if I find it, I'll pop it up on github and let you know via the chatterbox.

I would be wary; since the author has gone bye-bye, you'll be the one who gets to fix any bugs you find. If you're like me, and I know I am, you really don't want to take on more maintenance load just to use a CPAN module.