Shieldmaker/Armorer bonus stacking?

[georgioz]

Pretty much the title - do bonuses to armor/weapon damage from Copper/Iron resource stack? More specifically. Do the bonuses from two shieldmakers stack when they come from the same resource (two copper resources for instance)?. Do they only stack between resources for one of each - e.g armor from copper and armor from iron for total max of 2 bonuses? Do they stack for specific type e.g. one bonus to armor and bonus to weapons for each resource with four bonuses max. Do they stack in any way you want them to stack so you can pile up a significant armor bonus for instance?

[hoho96]

probably they don't since they don't give an automatic bonus, but an upgrade to the weapons/armor.
the bonus itself is from the upgrade level, and not the actual building. the building just unlocks the upgrade.

[♔Greek Strategos♔]

AFAIK they don't, Dresden could verify it though.

[Dresden]

Units get a flat bonus from whatever type of weapons/armor they have (the colored shield and weapon in the corner of the card)