This sounds like - take 4 things in everyone's house that no one uses and make something out of it. But it's REALLY GOOD! Just a nice balance of flavors. 

Shockingly good and well balanced. Pleasantly mild, unlike its apocalyptic moniker. I used Brennivin as the aquavit.

Great balance overall. Made with Svol aquavit (yellow bottle, Swedish style) which was very enjoyable, even if it does overpower the Jägermeister a bit.

Is the "chartreuse" specified here Green Chartreuse?

I confirm, does not work with Cocchi Torino.

Or maybe also because of izarra green i've used instead of Chartreuse.

Cocchi's equivalent would be Dopo Teatro Vermouth Amaro. It seems to work with that, though it is still a bit sweet for my personal taste. I might propose switching to a green Chartreuse rinse.

Excellent. I used Green Chartreuse and the other ingredients exactly as specified. Delightful balance. For a less sweet drink, I'd split the Punt e Mes 50/50 with dry vermouth.

Sparkling wine and Campari is an aperitif drunk in all the bars of Italy for over a century. In my city it's called Chiodino, meaning little nail.
This is because the carefully poured Campari penetrates like a nail into the wine.

Had to make some subs — El Dorado 8 for the rum, Rothman & Winter for the apricot liqueur), orange peel coin for garnish — but really enjoyed this one: the white port and apricot liqueur lent a juicy-fruity smoothness to the dominant rum (ED8 is one of my favs), the chartreuse a hint of herbaceousness, and the aromatic bitters tempered the sweetness slightly (though this wasn’t too sweet to me). Booze-forward but not overly so as I stirred it well. Nice sipper that went down quick!

Lightly curated. Note that the original (at link) specifies making a maple syrup syrup, and stirring and straining over rocks.

While the Imbibe link traces provenance to Little Branch, there are also references out there to a similar but not identical cocktail put together at Milk & Honey that went by the same name. 

Sasha Petraske founded both Milk & Honey and Little Branch.

The cocktail's co-creators are Richard Boccato and Michael McIlroy.  They both worked at both bars. But Little Branch probably deserves the nod. In Regarding Cocktails, Boccatto's quote about this drink:

Once in the midst of a sleepy shift at Little Branch, I asked Mickey whether or not a cocktail could be built in the glass and devised with ingredients that were slightly different from those that we used to make our house Old Fashioned.

This is a modern classic & I'd think Bocatto & McIlroy's original version (rather than the minor alterations made in PDX) should be found somewhere here.