While making a self reference [Inaros] I discovered that the Carapace mods are not exclusive, meaning you can stack all 3. This means you can stack them with [Primed Vigor] and other usual Health gain to get an extremely Beefy [Inaros].

To My knowledge this is the absolute max health build out there and one of My few originals. Since these mods also grant armor you end up with a lot of damage reduction even without [Adaptation] and get pretty darn close to 90% with 100% Scarab Armor active.