Permanent or mobile?

Permanent ones are easy to build. You just need common sense, tools and bit of experience.

Mobile ones are another thing entirely. A buddy of mine made one out of metal/aluminum. It weighed like a son of a gun and ended up costing him more than just buying one. I guess if it's more of a hobby then it's probably worth it.

The only bad thing about a homemade stand is that when it fails you're the only one to blame....

Tom