Wow, it sounds as though you've thought it through very carefully. That will be a lucky kitty. You are right to worry about thread - that can be a danger to dogs or cats - and I suppose you just have to watch to see what other things kitty decides to go for that might not be in his best interest. I have a dog and am seriously allergic to cats but I know they can be just as affectionate as a dog. Enjoy! And do let us see your new baby when he/she arrives.