The other modification to the doors I would consider if concerned about security would be to attach to the hinge side of the door a suitable steel bracket that overlaps the door frame when the door closes, one at each hinge, could even be attached by the hinge bolts (but if so ensure they are nyloc nuts so they cannot be undone from outside). This makes it so you can't enter the vehicle by driving the hinge pin out or unbolting the hinges.
 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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