Hey there again.
Thanks for the answer, Michal - I tried adapting a different one, but I'll gladly try it out with the one you suggested!
So, yesterday eve, after finishing the modeling phase, I finally came around to trying to create the array I'm after. At first I tried it building it from scratch, but miserably failed, as expected. So then I tried adapting and existing Cladding Macro and it worked kinda good, but I am still not quite there. Here is the current state (the Max file (v2019) you can find attached):


I know there are more elegant ways to solve this, but I cannot figure them out.
1. I achieved the horizontal randomization I wanted. But
how I can I randomize the vertical sequence in a less dull way than what I did above?
2. Is there a more elegant way to solve the corners, rather than the one side overlapping over the other? In the reference the planks seem to be beveled, so that no cut edge is visible (or is the only way to do that to bake the RC geometry and manually cut the edges?
Again, thanks a lot in advance!