Porting update_icon improvements. Part 1.

code/datums/components/armor_plate.dm

@@ -12,6 +12,8 @@
 	RegisterSignal(parent, COMSIG_PARENT_EXAMINE, .proc/examine)
 	RegisterSignal(parent, COMSIG_PARENT_ATTACKBY, .proc/applyplate)
 	RegisterSignal(parent, COMSIG_PARENT_PREQDELETED, .proc/dropplates)
+	if(istype(parent, /obj/mecha/working/ripley))
+		RegisterSignal(parent, COMSIG_ATOM_UPDATE_OVERLAYS, .proc/apply_mech_overlays)
 
 	if(_maxamount)
 		maxamount = _maxamount
@@ -75,4 +77,13 @@
 /datum/component/armor_plate/proc/dropplates(datum/source, force)
 	if(ismecha(parent)) //items didn't drop the plates before and it causes erroneous behavior for the time being with collapsible helmets
 		for(var/i in 1 to amount)
-			new upgrade_item(get_turf(parent))
+			new upgrade_item(get_turf(parent))
+
+/datum/component/armor_plate/proc/apply_mech_overlays(obj/mecha/mech, list/overlays)
+	if(amount)
+		var/overlay_string = "ripley-g"
+		if(amount >= 3)
+			overlay_string += "-full"
+		if(!mech.occupant)
+			overlay_string += "-open"
+		overlays += overlay_string