Thanks for telling us MadmanMSU. Our Survival server has a PvP option that players can activate personally. However, we are nice to each other's constructions.
That said, the big area that Exe (with helpers) walled in was intended as a battleground. I still have plans for running some treasure hunt challenges there. I believe Exe that you liked the idea of anything being built in there being fair game for others to destroy (other than the buildings on the wall and the wall itself).
For those who don't know which section I am meaning, go due west of the Spawn Fortress deep into the snow. The main building is surrounded by cacti in the middle of the snow (haven't quite worked out how to give links to specific coords on Thermal's Google maps yet).
ps. For those who like to run combat challenges on their own servers, there are a few mods out there that do "Capture the Intelligence or Flag" runs (e.g. http://forums.bukkit.org/threads/mec...f-670-740.250/
). Some other ones use the monetary mods to give rewards for killing players (e.g. http://forums.bukkit.org/threads/mis...list-740.3362/