Well, this isn't too impressive. But my brother-in-law and I built a pair of cat towers. You know, that amalgam of carpet and wood that serves as both a comfy home and a playplace for your feline children. The type we built would have cost $300 each in a store, and we must have payed somewhere around $40 each for them (since we already had extra carpet). They are about 4 1/2 feet tall, with one giant scratching post and a small one, three levels, and a little cat home at the base. Technically, we finished the first one and never finished the second. It is still taking up space in his garage. If you read this, Christos, I'll come back soon! I promise!