Just found a photo of the NR my dad drove for Collins Brothers of Bowraville in the late fifties - early sixties. It was powered by a Leyland 600 and apart from having 10.00 x 20's it was basically original at this time. Later however, it got a replacement chassis, cab, rag top and a set of EH Mack front guards, as the old ones fell apart from the corrugated goat tracks the local council called roads.
He also fitted an exhaust brake and water cooled the brakes to try and keep up with the B models, Autocars, Whites and Diamonds. They would leave him on the uphills but he could stick with them on the down hill, as he could keep his brakes cool. It was also one of the first log trucks on the North coast to carry the trailer, when empty. The ramps were made out of the original chassis. This was the first truck I drove, at the age of twelve.
The bottom log is 45 x 8'3" and the top one you can see is 20' x 9', not bad for an old jigger. I do have a small black and white shot somewhere of it with a one log load.
I laughed when you said it was basically original but got a replacement chasis, cab etc. What was original the radiator cap?
That is a bit of your history that you can treasure, I like it too.