Vanishing base construction

[RabidStoat 0]

Hi, 
I'm trying to set up a camp on my dedicated server but am encountering game-breaking levels of glitches:

1. I am intending to create a fenced enclosure, with no gaps, using fences and towers. Due to issues with clipping last time I tried this I have modified the CFGGameplay.json File to disable collision checking and enabled this in the server.CFG

   	"BaseBuildingData":
   	{
   		"HologramData":
   		{
   			"disableIsCollidingBBoxCheck": 1,
   			"disableIsCollidingPlayerCheck": 1,
   			"disableIsClippingRoofCheck": 1,
   			"disableIsBaseViableCheck": 1,
   			"disableIsCollidingGPlotCheck": 1,
   			"disableIsCollidingAngleCheck": 1,
   			"disableIsPlacementPermittedCheck": 1,
   			"disableHeightPlacementCheck": 1,
   			"disableIsUnderwaterCheck": 1,
   			"disableIsInTerrainCheck": 1
   		},
   		"ConstructionData":
   		{
   			"disablePerformRoofCheck": 1,
   			"disableIsCollidingCheck": 1,
   			"disableDistanceCheck": 1
   		}

    

2. I place my fence/tower kits in a circle and begin to add logs to them
3. As soon as I place more than one log to any kit it vanishes, taking the contents with it

Should I re-enable one or more of the above options? I have trouble following the logic between cfg commands and effects sometimes, but I can't see which would be causing the problem.
I see no trace of the activity in rpt, script_* or server logs, so apparently the game doesn't think there's a problem.