medoug: Sorry about that TTFN.
I myself discovered that the trebuchet had been removed just a couple of days ago. I suspect it was removed due to people climbing on it and because it was getting pretty weathered. I'm sure the college didn't want the liability of someone getting hurt.
As a result, I am regretfully archiving this geocache. It was fun while it lasted, and I'm glad that I helped a few more people seeing this great machine through geocaching before it was removed.
medoug.