DIY plans for cat furniture

Does anyone know of any websites that includes plans for do-it-yourself cat furniture? I want to make a simple type of furniture for my soon to be kitty. I'll need also to know what lumber, etc. to buy.

If anyone knows where I might find plans, please let me know.

Here are two I found when I was considering building my own. I didn't order from either of them because I decided to buy instead of build. http://www.cattreeplans.com/ and http://www.cat-tree-plans.com/

We are interested in making one or two anyway.. I have seen many great ideas in pet shows and so on but to actually do it I think will be a task. We may end up buying too. We already have one but I would love to have a big one.. For all the kitties not just a couple to hog..