Refactoring mob holders into an element.

code/modules/mob/living/silicon/pai/pai.dm

@@ -11,7 +11,7 @@
 	health = 500
 	maxHealth = 500
 	layer = BELOW_MOB_LAYER
-	can_be_held = TRUE
+	var/datum/element/mob_holder/current_mob_holder //because only a few of their chassis can be actually held.
 
 	var/network = "ss13"
 	var/obj/machinery/camera/current = null
@@ -64,9 +64,6 @@
 	var/list/possible_chassis			//initialized in initialize.
 	var/list/dynamic_chassis_icons		//ditto.
 	var/list/chassis_pixel_offsets_x	//stupid dogborgs
-	var/static/item_head_icon = 'icons/mob/pai_item_head.dmi'
-	var/static/item_lh_icon = 'icons/mob/pai_item_lh.dmi'
-	var/static/item_rh_icon = 'icons/mob/pai_item_rh.dmi'
 
 	var/emitterhealth = 20
 	var/emittermaxhealth = 20

code/modules/mob/living/silicon/pai/pai_shell.dm

@@ -43,6 +43,12 @@
 	set_light(0)
 	icon_state = "[chassis]"
 	visible_message("<span class='boldnotice'>[src] folds out its holochassis emitter and forms a holoshell around itself!</span>")
+	if(possible_chassis[chassis])
+		var/datum/element/mob_holder/ele = SSpai.mob_holders_by_chassis[chassis]
+		if(ele)
+			current_mob_holder = ele.Attach(src)
+		else
+			current_mob_holder = SSpai.mob_holders_by_chassis[chassis] = AddElement(/datum/element/mob_holder, chassis, 'icons/mob/pai_item_head.dmi', 'icons/mob/pai_item_rh.dmi', 'icons/mob/pai_item_lh.dmi', TRUE)
 	holoform = TRUE
 
 /mob/living/silicon/pai/proc/fold_in(force = FALSE)
@@ -69,6 +75,8 @@
 	holoform = FALSE
 	if(resting)
 		lay_down()
+	current_mob_holder?.Detach(src)
+	current_mob_holder = null
 
 /mob/living/silicon/pai/proc/choose_chassis()
 	if(!isturf(loc) && loc != card)
@@ -117,19 +125,6 @@
 		set_light(0)
 		to_chat(src, "<span class='notice'>You disable your integrated light.</span>")
 
-/mob/living/silicon/pai/mob_pickup(mob/living/L)
-	var/obj/item/clothing/head/mob_holder/holder = new(get_turf(src), src, chassis, item_head_icon, item_lh_icon, item_rh_icon)
-	if(!L.put_in_hands(holder))
-		qdel(holder)
-	else
-		L.visible_message("<span class='warning'>[L] scoops up [src]!</span>")
-
-/mob/living/silicon/pai/mob_try_pickup(mob/living/user)
-	if(!possible_chassis[chassis])
-		to_chat(user, "<span class='warning'>[src]'s current form isn't able to be carried!</span>")
-		return FALSE
-	return ..()
-
 /mob/living/silicon/pai/verb/toggle_chassis_sit()
 	set name = "Toggle Chassis Sit"
 	set category = "IC"