Just saying thanks as I installed a new safari on my d2a today using these instuctions as well as safari's.
One thing for any new players, check the supplied template on the snorkel first. Mine was out a bit, I guess that's why they get you to go to 16mm on a hole for a 10mm stud! As per OP I only went to about 12-13mm.
When sealing the airbox there is a little square hole on the bottom just Infront of the water trap, don't forget about that.
Although its not required and probably didn't make any differance I opened up the inner panel slightly to match the snorkel inlet as it was slightly off center.
Another thing I noticed is the snorkel head sits up quite high ( compared to others ), if I noticed this before I fitted everything else up I probably would have cut 10-15mm out of the top of the snorkel body to try get it a bit lower and streamlined but that's just me being picky!
All in all an easy job with the instructions in this thread, attacking the 1/4 panel with a 70mm holesaw is a little daunting at first haha.
Have a safari snorkel template in SE suburbs VIC if anyone ever needs to borrow.
Weighing in to the "do you need one argument" if your going near water I would.
I believe it would easily be possible to get water up to the factory intake without it getting into the car and compromising other electronics, well unless your "dead in the water"
1986 Range Rover Hiline
2004 D2 TD5
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