I fitted them (or similar) to my 110 about fifteen years ago. Fitting to a Defender (or a 110 with the pushbutton doors) would be a bit easier I think, as they use  more conventional locks. It is quite a bit of work, but there is nothing really difficult about any of it. 
The actual system has proved to be totally reliable except that the wires are prone to breakage where they are bent with the opening of the doors (particularly the driver's door as it gets opened most frequently on most cars). If possible arrange for the wires to twist rather than bend. Expect to have to use some ingenuity in routing the wires. Broken wires, particularly intermittent breaks, can give the strangest symptoms. Thinking ahead, make sure the supply fuse for the controller can be accessed easily to disable the system in the case of a fault.
I have added an actuator for the back door, this needs a bit more ingenuity, and I posted a picture of this in a thread about central locking in a County a day or so ago. I think the Defender rear door lock is pretty much the same.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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