That's pretty nice!

I'm doing the same thing....I have a high sendero up on the side of a hill that having a tower at will give me an enormous field of view. I've been hunting around looking for a 10-15' tower so I can build some simple railing up to with a platform. I've already got a really nice 'shoot house' style rig I want to keep on the ground.

There are a few local manufacturers around these parts (S/C Texas) Try googling it, see what you can come up with. All my links are saved on my computer at work, I'll post them up here when I get back there on Monday.