I am wanting to make some ladder stands. I have a lot of 1/8" x 1" square mild tubing, but I would like them to be lighter if at all possible. I am wanting to make them 15 feet from platform to the ground. What would be the best material for this project?

If anyone has any other info on building stands, such as plans, etc. I would really appreciate it. I am looking for any advice I can get.