The Discovery fort is 5'x 5'(deck floor) and rests approximately 5 feet off the ground. It's designed for children under the age of 12 and can support over 250lbs!
$379 build it yourself jungle fort swing set
Outdoor Wooden Swing Set Plans | ... Swingset Plans for your backyard at everyday low - Swing Set Paradise
outdoor playsets with monkey bars plans | ... Sets - Wooden Swing Set Kits, Playset Plans & Swing Sets Accessories
Pathfinder Swing Sets Kits: Kits & Plans for Outdoor playsets, furniture, etc.
DIY Kit for 3 seater swing set.
Pioneer DIY Play Set Hardware Kit, Swing-n-Slide, Wooden Swing Set Kit http://www.woodenplayscapes.com/product/SNSNE-4433
Adventurer Wooden Swing Sets / Fort Kits
outdoor play houses with slides | Playhouses and Kits to Buy - Build Your Own Playhouse or Treehouse
This is more suitable for out building skills, plus it includes a rock climbing wall.