I will just be getting my coolant feed and return from the heater hoses, the same way the other guys have done it, as unfortunately I don't have the add on block for the coolant drain at the back like you have. Plus I will be pulling my oil feed from the left of the filter housing, there is an oil gallery there that should take a 1/8 bsp fitting.
As for the HT12, they were also used on the QD32ETi engines, so there should not be an issue there, I'm installing a HT12 on mine as well.
My Qd has a R50 terrano oil filter housing.
i ****ed the alloy thread adapter block for the oil feed by over tighten it.
Now it has a speed flow fitting
directly into the block is a ?M20 to -4An. (wd21 filter housing is not m20, is another thread type)
then a -4an to -3an adapter.
then a -3an to braided oil line
to a -3an m10? banjo bolt on the turbo.
Personally i would get the TD27 water fitting and do it from the rear of the block, its so much nicer and neater looking than taping into heater lines. I personally think most peoples taps into heater lines looks ugly as sin.
with regards to the dump pipe.
if you have the terrano dump, with the terrano 'front pipe' (pipe from dump to mid gearbox) other pipe you can join it directly to the nav exhaust. -easy-done.
I bought a 2.5inch ZD30 navara dump pipe as it has the same turbo flange. This ended up being to long, as the bottom of the pipe hit the diff flange. This was easy enough for me to cut and re weld about 6Cm shorter. This fits up fine.
I have a 2.5inch mid section that finishes at the rear of the gearbox.
From here i just adapted it into the stock rear section before the last muffler.
its a quiet system like this.
later on down the track ill finish it off in the 2.5inch size with a high flow muffler.
Ive heard it without a muffler and it sounds like poo. The 6cyl diesel turbos sound way better, but with the pulses of a 4cy - its just a crap sound unmuffled.
I cant see any reason why you cant pay an exhaust shop to make you one, but as its custom work, be prepared to pay for it.
With regards to the intake.
I kept the stock QD intake manafold, i know some people swap to Td27 ones but the qd one has larger inlet piping.
i used a turbo adapter that came of the turbo and went to a straight piece of 2.25inch.
from here i used a silicon joiner that went 2.25 to 2.5inch.
from here a piece of oil intercooler pipe with a tight 90 degree bend.
then a straight 2.5inch joiner into he intake.
i think it looks rather neat and stockish.
Where abouts in Sydney are you?
I'm in Castle Hill and looking at doing the exact same thing to mine in about 2 weeks, I'de be happy to help out/exchange info.
I've stripped all my parts from a TD27 (manifold, turbo, coolant and oil lines and fittings, airbox, intake) and was hoping to just swap most of it striaght over.
A lot of people seem to dismiss this turbo as an option for the QD32 as being too small? do you know much about this?
Personally I'de be happy with it running at about 7psi, so not concerned if they just run out of puff at high RPM's, can anyone confirm this?
I purchased a TD04 but it looks like it would be a much harder job to fit than the HT12 and will mean a lot more custom work and time off the road.
I opted for a Ht12 because i dident want Lag, i put a t25 on a td27 and it was to laggy for me, i wanted more low down boost.
HT12 boosts pretty quick and i have mine set to 9psi without an intercooler.
Ill properly add a W2A setup later in the year and up the boost a little bit, but for now im more than happy with the difference its made.
I have personally seen other guys running 20psi thro the Ht12s on td27s. It will spike to 20 psi and go go down to around 17psi in the higher rev range. This is with the waste-gate disconnected.
I cant see any reason why you couldn't push a reliable 14.7 (bar) of boost through a Ht12 and a QD.
In the higher gears mines hit full 9psi of boost around 1700rpm and will hold all the way to redline if you can be botherd going that high.
in the lower gears full boost hits around 2050 rpm.
I worked out the shift point don't really make the car any faster if you change at 3krpm or 4.5rpm.
so ill usually shift at 2.5k when im crusing town, or 3.5k building speed or towing.
anyway, if you have any questions, feel free to ask, more than happy to help.
My D22 build thread is here and has pictures of this stuff too.
http://www.navara.asia/showthread.php?t=25611