Playground equipmemt

I have a simple requirement for a light but strong piece of climbing equipment for a playground. Very simple design and concept. Will have beams, bracing, supports, lockings device, and interchangable parts to keep the players interested. This will have several components that link together by locking devices, and it may need to be moved around from time to time, so each piece needs to be less than 60 kilos (or 2 men to carry the piece) Please only apply if you can work out the safety calculations to ensure that the equipment is safe. I will require 1D, 2D, .dwg and PDF file as delivery, and revisions along the way. In both A3 and A4 size. The work you will do, will be enough for me to give to the fabricator to make the prototype. I would like to deal with engineer / Auto cad designers that have done similar work, so please send me sample of this type of work. I also dont like being flooded by GAF memebers who DONT read the specification so please include the word CLIMB in your intial message to me. I will score you based on that, previous work and price. I will own all the IP and a NDA will be required to be signed before I pay any escrow. Thanks I would expect this to be a couple of days work for a good CAD person that has dealt with this before.