Armour Stacker JUGG Theory Craft [Replica Dream Feather + The formless Flame]

This is my first attempt at creating a build from scratch (3,479 hours played First PoB from scratch, still very much a noob but I gotta start somewhere). I started with 2 items, the Brass Dome + Replica Dream Feather, and the Jugg ascendancy that doubles armour. My goal was to build damage through stacking armour. Through research from ThisIsBadger/PoB videos and randomly discovering uniques (The formless flame) I've put together what I think could be a solid build with some more guidance and useful tidbits that you all may know. One thing to note is that I don't know how to add the new enchant from flask that increase their effect, so I'm probably missing some good DPS from there.

POB Link:
https://pastebin.com/XRHPzPDe

» The main way to scale armour rating is with the cluster jewel notable: Warning Call + Ancestral Cry + Determinism.

The high base armour on the brass dome + the JUGG ascendancy passive, Unbreakable, helps a lot as well to scale.

The only non-realistic item is the amulet because of the S++ implicit rolls. I bought the only Determination + Pride watchers eye moments ago. Just looking for any feedback before I start twink leveling a marauder.

If there was a better way to scale damage please let me know. If there was a better damaging skill other than Shield Crush please let me know. If there was a better ascendancy choice please let me know.

Does Vaal Molten shell have the guard skill tag? Can you have both normal and Vaal MS up at the same time?

Sorry if this build already exists somewhere else. The character is not created yet.