I don't know the original author of this map but since it seems to be popular I'll add a copy here. If someone know where it came from please let me know.
Good for 3-8 people in closed arena allowing plenty of "dodge & cover" while playing.
Pfhorge is an OSX map making utility, as yet uncompleted but usable. There are still bugs with terminal editting and map compilation while the texturing can't be carried out in the visual interface.
I've included a manual that assumes you are already familiar with Forge.