Anyone build a wooden play structure?

[spacescape]

I'm on a mission to try and budget a small outdoor jungle gym for my 3 year old and 5 month old (not that he can use it yet). Went looking at a couple of USED structures tonight and they are pretty old and beat up and just not worth the effort to move. Still plan on looking but also looking at just building one from scratch and looking for advice. In all honesty, I don't have tons of room and probably will only be able to build a two tier structure w/ a canopy (with the sandbox underneath if we choose). We'd probably want a slide and a climbing wall (rock wall). Home Depot had some kits that you "JUST ADD WOOD" which we all know is the expensive part.

http://www.swing-n-slide.com/timberbilt/

Anyone know where I could buy plans or a simple kit for just making the two tier structure tower? Anyone have any advice? My dad says "don't do it" but we would like something for the boys to do when we are busy getting dinner ready and can't take them to the park.

This is really what we want w/o the sing or the spiral slide... Almost seems as if I could build this from scratch.

http://www.swing-n-slide.com/timberbilt/...woodII.htm

Thanks.

Bill