I built one — it’s somewhere in the "favorite photos" album on my MSN Space:

http://spaces.msn.com/Artist333/PersonalSpace.aspx?_c02_owner=1

Build a smaller version. Put the house at the bottom (or top?). I used half-inch plywood for the house; 3/4-inch plywood for the platforms; cut holes in a platform so they could play "got cha"; put tile on the bottom platform (because they like cool places in the summer); used two 2"x2"x8′s, glued together for posts; 12" disks for the ‘tree’ tops. I cut a 24" disk in half to make a "deck" and covered it with scraps of carpets to make it look like flagstone; I put a hole in the bottom of the house, as well as the front, so they could get in both ways; there’s a "shelf" (to lay on) removable, washable rug inside the house. Covering it with carpet [staple it] may have been the trickiest part — that takes planning and patience.

4"x4"x8′s or PVC, perhaps, can be used instead of 2"x2"x8′s that I used. Also, ask at a carpet supply center for the bolts they receive carpet on — they might make good posts (covered in carpet).

Be caustious in using glue. Cats would like the strong scent.

Look at "condos", and other cat-climbing things at pet supply houses and in magazines, for ideas. Then design your own. I kinda designed as I went ("measure once, cut twice"-kinda building), but planning details (and patience) can get you a real nice "tower".

I spent on this what I would have paid for a tiny house and one or two short posts. I have six cats and they LOVED this!!! [Cut (your) 2"x2"x8's to desired heights.]

That’s my input. Have fun!!

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