Suppose you generate random chords of a circle, with endpoints selected uniformly over the circumference, rejecting any chord that crosses a previously generated chord.
The disk is then partitioned into regions bounded by chords alternating with circular arcs.
For example, here are $n{=}100$ random noncrossing chords, with a region bounded by 5 chords highlighted
(in green).
<br />![alt text][1]
<br />
I am interested in the statistics of the structure of the dual trees for these regions. 
Assign each region a node,
and connect two nodes by an edge if they share a chord.  In the example above, the highlighted
region's node has degree 5.
Example questions: What is the expected maximum degree of a node for $n$ chords?
Making a max-degree node the root, what is the expected height of the tree?
(In the example above, the height is 21.)
Etc.

Has anyone encountered this model before?
Or a model sufficiently analogous to help establish these statistics?
Thanks for any pointers!

  [1]: http://cs.smith.edu/~orourke/MathOverflow/Chords100.jpg