I have decided to temporarily drop support for Facepunch's Deathmatch until the game is more stable. Currently performance quickly takes a nose dive when playing the map in Deathmatch, and it just isn't a great experience.
Hopefully stuff like this won't be a worry in the future.
For the time being you can just take a look around the map with Walker. Technically you could still load the game up in Deathmatch but there will be no pickups included.