Thank you for your comments
Continued with the build immediately after work today; main and tail gear install.
Head. Came pre-assembled.
Sam warned me about ordering a bunch of parts before I got the kit - and he was right

I ordered the red (harder) dampeners, but they were already included with the kit. Well well, guess I have spares then.
Removed stock black (soft) dampeners, and replaced then with red (hard) ones.
After removing the feathering shaft from the head, I thought I would add new thread lock on both the bolts. But I could not for the life of me remove the last bolt! It was on there GOOD! The people over at Gaui must have used a whole tube of red TL and applied a ton of torque on this bolt. I even warmed it up almost to the point it was glowing red - but NO GO! Well, I know it's not gonna come off during flight, so I just left it as is.
Small note: there is a plastic shim between the head and arms, but ALSO a very thin shim that is not depicted in the instructions. I left it on there.
Head assembled back together and checked for TL on all bolts.
Swash, checked for TL. I'll just consider myself part of the "3D Master Club" now

LOL
The instructions calls for the head to be installed now, but I will wait until I have set up my servos first.
And now for the "battle at man cave" against the fuel tank beast... MY GOOOOOOOOOOOOOOOOD I HATED THIS ASSEMBLY. This is the most idiotic assembly I've ever come across.

I get angry just writing about it!!
Got some extra fuel line.
Assembled the clunk (mistake!). This was pain in the behind - with capital B!!! Threading the line over the flanges proved extremely difficult - at one point I almost threw the whole thing out the window!!
Found out I had to take it off again!!!!!
Because this thing is supposed to go on first... OMG
Now to press this assembly into the small hole in the tank. Easy? Yeeeeeeeeah......... The curse words. Oh, the curse words. The man cave was no place for children during this install that's for sure!
Tried this method. Plugging the big piece in first, then try to press the rest in. This resulted in the whole assembly popping inside the tank!!!
Fished out the assmbly, had another go - this time I hurt myself and the clunk fell of the fuel line inside the tank!!!
After taking a break to cool down, I sanded the edges of the tank- washed it out thoroughly with water - plugged the plastic end of the fuel line inside the big rubber grommet. Then I oiled the edges and grommet, used a small flat screwdriver and finally got it in there.
THIS ASSEMBLY SHOULD HAVE COME PRE-ASSEMBLED!! ARE YOU HEARING ME GAUI!!!?!!
Even though the manual states the included fuel line is Ø5.5mm and the Align fuel lines (which I got as extra) was supposed to Ø5mm, the Align line (green) looks larger?
Planning how fuel lines are going to be run.
Tank mounted.
Auxiliary fuel tank. This luckily came pre-assembled! Whew!
The aux fuel tank comes only with one single screw to hold it on to the bird, so I devised some extra support.
Good as gold
Got the Align fuel filter.
Finished running the fuel lines. Nitro people, please check I've done this correct.
Even though this part of the assembly took a few years of my life, I'm quite satisfied. Now I'm just hoping my Sat's and governor sensor will show up within the weekend.