Another woody thread! Seeking construction advice

Yep sorry another thread about building a woody. My main objectives are: cheap, easy/quick to build. Doesn’t have to look nice or last for many years.
I have 2 trees in my back yard I was going to use as the main supports. Bad idea?
If not, what do people use for attaching beats between trees without damaging the trees? Would cable/chains and some padding work?
Next for the horizontal beams between the trees, what dimensions would I need?
Alternatively, I wonder if I could could just hang something directly off the trees.
Any input is appreciated! 

Trees are living and flexible objects, I dont know if they would make a very good support for a wall. I would not use them myself, instead I would bury upright posts to use as your supports. YMMV since lots of people build very elaborate tree houses.

Fucking. Send. It. 

Whatever you do, make it steeper and harder  than you think you want.

It won't be fun, but it'll be effective. Which, ultimately, is more fun.

How much wood do you have? I think below would be better. It was pretty easy to construct and solid. I think the problem with the trees is the part where you have wires going to the trees. What's the distance between the trees? You would probably get more board space with a design like I showed (in the image) where it's a freestanding climbing board.

Also - let me know when you make it. I have a couple climbing holds and some wooden climbing holds I've been making for fun that I could give you. This is John Erik's friend BTW. 

Even though those trees are not hardwood, they look big enough in diameter that they would offer good support.

The best way to do it so you don't damage/kill the trees is to build a 4 sided "box" with 2x6s or 2x8s around the tree truck. Then drill a shallow, large diameter hole under the box and drive in a 1" diameter wooden peg to keep the "box" from sliding down. You want to minimize the amount of holes you cut in the bark and preferably not use metal, which introduces bacteria etc. The bark is the only living part of the tree. Look at ropes courses to see how they mount to the trees.

You don't want just cables or ropes attaching the wall to the boxes on the trees. You want solid wood so it resists movement in all directions. If you use cables or rope it only resists outward force, you want it to resist inward force as well. Otherwise when you do a dynamic move to reach for the next hold the whole wall will move.

Decided to go with an indoor one, still have those holds John? I’d love to get my hands on one.

E Mann wrote: Yep sorry another thread about building a woody. My main objectives are: cheap, easy/quick to build. Doesn’t have to look nice or last for many years.
I have 2 trees in my back yard I was going to use as the main supports. Bad idea?
If not, what do people use for attaching beats between trees without damaging the trees? Would cable/chains and some padding work?
Next for the horizontal beams between the trees, what dimensions would I need?
Alternatively, I wonder if I could could just hang something directly off the trees.
Any input is appreciated! 

nullnull

Mine cost about $700 to build (12x12)  and I have $400 in holds (1/4 of what I actually need) cause I have a 40 degree and need more expensive larger holds. Keep that in mind too.  Unless you want v6+ every time.