There are 17 Different custom build sites available. 

Choose which you would like to use (can also see in server what they look like before using)

After purchase Ticket Dead Nasty in Discord and let me know which you would like to use (up to 5 per player, purchased separately).  Then Dead Nasty will give you a flare to throw wherever you want your spot on the map, throw the flare and there is your custom spot no one else can build on.

This is a Monthly Subscription, you are responsible for cancellation.