Hi Mick,
There are a bunch of different people who re-sell the double DIN defender fascia units, but I believe almost all are manufactured in Germany (not sure if Nakatanenga is actually the manufacturer or just the primary distributor). I bought mine (online) from Land Rover Tuning here in NSW. As far as I could tell when I was looking, the landed cost is pretty much around the $600 mark regardless of where you buy it from. Which is bloody steep for a bit of plastic! If someone can easily replicate them for less there's a market there I would have thought...
You have to cut off (and 
keep, so cut it neatly 

) the part at the top with the air vents and clock. That gets reinstalled above the new double DIN fascia. You also have to trim back the base of the clock housing, which would hit your new stereo/navi unit otherwise.
I think it takes any 7" unit, but I don't know so double check this. I installed the Alpine INE-W957A, which is great (but not cheap). Lots of options on ebay though.
Really the only reason it was a PITA is because I kept trying to take shortcuts... I thought I could get away without separating the wiring loom to the switches (and then with only separating it less than ended up being necessary), and without removing the metal bracket which sits directly behind where the new stereo unit would go. Lesson: you do need to do these things. Otherwise you've got to disconnect all your switch wiring and pull the bloody thing out again. Multiple times. I did manage to do it without extending the loom though, so that was a big plus.
Another thing to watch out for is to make sure you've got compatible plugs to connect the new unit to the old loom - should ideally be mostly plug and play, but there are lots of different connectors out there (even in the same brand stereo) so just check. May need to wire into the handbrake warning lamp circuit (or just earth this wire) depending on what sort of system you install. 
Other than that, cutting dash panel beside the steering wheel to fit the new relocated switch panel took me some time to get right... I erred on the side of cutting it too small to start off with, and it took a lot of fiddling to enlarge to exactly the right size. That's probably just operator error though!
Anything else just ask.
Nick
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