Thanks for the compliment on the pics! Those particular ones were done in the summer of 2003 but I've taken more photos since. That whole set is absolutely amazing, esp. the birds in the big room. Did your friend do some at Wetherill too? It doesn't really appear to be his style but then again I don't know what he's doing differently today vs. 7 years ago.
In unrelated news, I just scored a postcard yesterday of Fort Mansfield from the 60s or so. Graffiti is there, yes, but not spraypainted. Interesting, should scan it.