Good news! I finally made a version of the map pl_siege that doesn't crash! I realize it is now far to late to test it on your server, but I was wondering if I could submit it the next time you hold an event like this? At any rate here is the download link if you are still interested in looking it over.
http://forums.tf2maps.net/downloads.php?do=file&id=6131&act=down
http://forums.tf2maps.net/downloads.php?do=file&id=6131&act=down