Something I've been playing with over the summer during practice, These little guys work pretty good as small steps or even little platforms, ring around the tree idea. If you have access to a plasma cutter or even a Dremel you could try them out. I used 16ga steel so mine aren't light I might even go bit heavier just for safety factor (I'm 220 if you wanted a ref). Plan is to use for presets and not drill trees. If you make out of alum I'd bump up the Gage you'll have to test yourself I haven't made any. nice thing is they nest so super easy to carry. I've started using car door weather striping on the top edge for grip and safety when climbing, not shown in pics.