After gathering a lot of great ideas here on the forum but not quite finding exactly what I wanted, I've built my own slider setup for my D4
I wanted to install the fridge slider:
1. without drilling any new holes in the car;
2. leaving access to drop the spare wheel, preferably by allowing the other third row seat to be set up;
3. without drawers taking up unnecessary space;
4. in a way that allowed me to completely remove it relatively easily when back in town.
I made it a bit more of a challenge for myself by choosing a larger fridge in the Waeco CFX-65 (which incidentally has exactly the same footprint as the CFX-50 and is just a bit taller).
 
 
 
After the initial construction I also decided to try and make / source a cage to allow me to pack around and on top of the fridge whilst still being able to use it - nothing new about that idea.
The end result you can see in the photo above. All of my objectives have been met- 
* no new holes in the car;
* seat can be raised and spare wheel winder is accessible;
* all the space not taken up by the slide is still clear to store 'freeform'- no drawer shape / capacity constraints; and 
* the whole assembly can be removed by undoing the 2 straps and removing 2 bolts.
 
There is also still about 250mm of storage space between the cage and the middle row seats.
The base is anchored to the tie down holes on the outboard side and the inboard side to the seat anchor plates between the seats.
 
 
Unfortunately the Waeco slide width for the larger fridge meant that if I wanted the bolts through the baseboard into the tie down holes to be accessible (they were under the slide) I had to make a couple of offset brackets to screw into the tiedowns with another threaded hole to fix to through the baseboard.
 
 
 
At a high level, the steps were as follows:
Determine required depth (thickness) of base - which is just under 40mm (37mm) as stated above.  Note: as the slider itself provides some extra clearance you could get away with a bit less.
Cardboard template for shape and hole placement
Cut 18mm plywood to shape and drill mount holes
Screw and glue 22mm decking to underside to increase height for clearance (I'd originally planned to leave the inboard edge clear to allow me to slide a couple of tarps under the base board but abandoned this later as I wanted the extra 'meat' underneath to fix the cage screws into.
Position slide on base and drill 8mm holes through
Use ~22mm speedbore to create a rebated hole for t-nuts ( I used these rather than just screws to provide more resistance to lifting out.  They also provide the advantage that you dont need access to them (like a nut) to fix machine screws into them.
From underside drill 10mm holes about 10mm depth to fit t-nuts
Tap in t-nuts with hammer
Fix slide to base - I used 40mm m8 button head socket machine screws
I then made my offset plates to allow me to fix the base to the tie down holes with an offset of about 14mm
Fix base in car and check slide clearances etc.
For the inboard fixing between the seats I used a strap anchor at the front seat base to secure the 25mm strap and at the rear the strap was threaded under the seat base mount plate.
These are secured with slide buckles, leaving a single strap above the seats in the cargo area to secure to the cam buckle strap fixed similarly to the cage as per pic.
Then, just for aesthetics I removed the slide from the base and carpeted it.  Carpet from Bunnings
I toyed with the idea of making a cage from mesh myself but after pondering all the bending etc. I took the easy way out and bought one off ebay.  Nice that it was exactly the right size.
Because of the layout in the cargo area - the plastic moulding protruding into the space- I had to omit the outboard side of the cage and so just made up a bit of carpeted plywood to screw to the cage mounting tabs.  
 
The whole thing was a case of measure 4 times, cut once as it is very tight with only a few mm of tolerance in a few spots.
I tried to limit the photo postings but I'm more than happy to provide more details or photos if anyone is interested.
 
Will give it some more time in the car once I've installed my Traxide DBS this weekend.
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