I created a new Automaton character and selected Reinforced Chassis.
The feat itself correctly updates AC, so Reinforced Chassis appears to be recognized by the sheet. However, after some fiddling around i noticed armor runes etched/slotted onto the chassis do not apply their effects or any associated stat changes.
Because Reinforced Chassis states that the chassis counts as medium armor in the plate group for abilities and for etching runes, I expected armor runes on the chassis to function the same way they would on normal armor.
Am I missing something, or is this a bug? Any help would be appreciated.