assets.models.py

class Feature(models.Model):
	# A feature is what occupies a slot, it can be a man-made constuct or natural terrain.
	name = models.CharField(max_length=255)

maps.models.py

class MapLayout(models.Model):
	name = models.CharField(max_length=255)
	image = models.ImageField(upload_to=/maps/)
	
class Slot(models.Model):
	map_layout = models.ForeignKey(MapLayout)
	number = models.PositiveSmallIntegerField() # The ID of this Slot within a map.
	longitude = models.PositiveSmallIntegerField()
	latitude = models.PositiveSmallIntegerField()
	starting_feature = models.ForeignKey(Feature) # The feature feature exists on the Slot when a game begins.

towns.models.py

class Town(models.Model):
	name = models.CharField(max_length=255)
	map_layout = models.ForeignKey(MapLayout)

class TownSlot(models.Model):
	town = models.ForeignKey(Town)
	slot = models.ForeignKey(Slot) # Defines the coordinates and starting feature of this Slot
	feature = models.ForeignKey(Feature)