What shall we call this thing?

I intended to log the tree fort's progress, and I've been taking pics, but hadn't posted anything yet.  So this is the quick catch-up...

Here's a sketch of what we're aiming for...just imagine a maple tree in the middle.

April 9th: Ground has been broken and construction has begun.

April 12th: The first three poles are in the ground with footings poured.

Ack!--the hole ate my assistant!

April 21st: All poles are in the ground and all 4 outer joists are secure.

April 29th: Yes, a swing was functional for his birthday on the 27th.

April 29th: All 4 top railings are secure and the swing header mounted.

May 12th: We have the beginning of a deck...and a slide!

May 16th: Vertical rails have started to appear.

May 28th: A climbing wall!--now there's a way to get to the top of the slide!

(Thanks to those who've helped so far with tools, ideas, & muscles!)

At this slow-n-steady rate, 

she'll be ready in time for...