Thank you to everyone for your input and advice. I read the article LuckyRescue linked me to and I was very shocked. I have trimmed his claws twice, and while it isn't Tucker's favourite activity, he doesn't mind. Plus his vet trims him too. I usually have to catch him when he is dozey.
I priced out and looked at some cat houses (I think they are called) for climbing and scratching and such. Some are rather expensive, but others are reasonable. I think I could probably make something really cool for my cat, if not I'll buy one. He has outgrown his scratching post I made for him when I first got him.
Thank you all again. I am glad I found this site!