Biggles,
I had some good laughs (and tears as well) reading through all your posts here now.
I would really like for you to make contact with me - I am sure I can also give you lots of info about all the mods done to the car.
One thing I must say about the fuel consumption - it did go up a bit when I jumped from the 265/75/16 tyres (which is standard on these Patrols) to the 305/75/16 that are on there now!! Keep in mind that is quite a bit more rubber on the tar - and I used to average 5km per liter after the tyre change. It used to sit around 6.5 to 7 km per liter - but that was 3.0l and still the smaller tyres. I am sure you will get a better fuel consumption if you go down to 285's (which is what I should have done)!! Unfortunately I was "gat jeukerig" for a mean machine look and could afford it at the time!!
On the picture on in the dunes I wish to comment as follows - I am not sure what you tyre pressures you were running there - but I have been to Atlantis dunes on many occasions with the Patrol and used to let my tyres down to 0.4 bar -

no jokes!! I never experienced any tyres coming off the rims - as long as you obviously do not do any lock and turn under "speed" as well - but gradual turns under speed no problems.
There is a long sand dune in Atlantis (it is called something like horse shoe or devil's peak or something similar) all I know it is prone for it's long haul to the top!! That Patrol you have now went out there and were the only diesel vehicle (and 3 tons of it on top of all!!!) that day that did make it out there. In fact a guy with a 3.0l petrol Pajero tried several times - made it eventually but overheated his motor so much he blew the motor on the way out of the dunes. We still towed his car back to my house where he had it collected with a flatbed truck.
I know it won't go where most Petrol models do - but do not under estimate that 3 tons of Patrol with flat tyres in the sand - he will surely give you some surprises!!
Hope to meet you soon!!
PS: Did you meet up with Frans as I can't recall him mentioning it to me??