How about a ground based pvp zone on a starbase or whatever you want to call it, but it is based on airlocks?
The play area is a circle like earth space station. On each side; north, south, east, and west, we have a storage area with an airlock.
Each of the four rooms has specific upgrades inside the storage rooms.
Each of the four rooms has an airlock to open the storage room to open space.
On the outside of storage room (inner hull) of each room is a button to shut the door and a second button to open doors/ airlock (outer hull) in room.
Each person has an space suit to equip (in case the airlock is open to space).
The space suit restricts movement by about 50%, but if you have the space suit on when airlocks are open...you are immune to the exposure of space, if not, instant death, the red vaporize animation kicks in (ideally they get sucked into space for an animation but vaporize animation will get the point across).
If you decide to grab an upgrade in a storage room, you can risk it and just grab it without space suit on, or you can equip space suit and hope no one catches you with it on. Team work would be the key on this one.
In summary, if the details are tested and worked out, this could be a blast and very addictive for pvp. Cat and mouse style pvp. Everyone wants the goodies in the storage room but it comes with a huge risk.