Allow you to construct and deconstruct fire extinguisher cabinet. Also minor refactor. (Credit to Tigercat2000)

code/game/objects/items/devices/radio/intercom.dm

@@ -45,15 +45,16 @@
 	name = "station intercom (Security)"
 	frequency = SEC_I_FREQ
 
-/obj/item/radio/intercom/New(turf/loc, var/ndir = 0, var/building = 3)
+/obj/item/radio/intercom/New(turf/loc, ndir, building = 3)
 	..()
 	buildstage = building
 	if(buildstage)
 		processing_objects.Add(src)
 	else
-		pixel_x = (ndir & 3)? 0 : (ndir == 4 ? 28 : -28)
-		pixel_y = (ndir & 3)? (ndir ==1 ? 28 : -28) : 0
-		dir=ndir
+		if(ndir)
+			pixel_x = (ndir & EAST|WEST) ? (ndir == EAST ? 28 : -28) : 0
+			pixel_y = (ndir & NORTH|SOUTH) ? (ndir == NORTH ? 28 : -28) : 0
+			dir=ndir
 		b_stat=1
 		on = 0
 	global_intercoms.Add(src)

code/game/objects/items/mountable_frames/extinguisher_frame.dm

@@ -0,0 +1,10 @@
+/obj/item/mounted/frame/extinguisher
+	name = "Extinguisher Cabinet Frame"
+	desc = "Used for building extinguisher cabinet"
+	icon = 'icons/obj/closet.dmi'
+	icon_state = "extinguisher_frame"
+	mount_reqs = list("simfloor", "nospace")
+
+/obj/item/mounted/frame/extinguisher/do_build(turf/on_wall, mob/user)
+	new /obj/structure/extinguisher_cabinet(get_turf(src), get_dir(user, on_wall))
+	qdel(src)

code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -90,6 +90,7 @@ var/global/list/datum/stack_recipe/metal_recipes = list(
 	new /datum/stack_recipe("air alarm frame", /obj/item/mounted/frame/alarm_frame, 2),
 	new /datum/stack_recipe("fire alarm frame", /obj/item/mounted/frame/firealarm, 2),
 	new /datum/stack_recipe("intercom frame", /obj/item/mounted/frame/intercom, 2),
+	new /datum/stack_recipe("extinguisher cabinet frame", /obj/item/mounted/frame/extinguisher, 5),
 	null
 )
 

code/game/objects/structures/extinguisher.dm

@@ -7,6 +7,13 @@
 	density = 0
 	var/obj/item/extinguisher/has_extinguisher = new/obj/item/extinguisher
 	var/opened = 0
+	var/material_drop = /obj/item/stack/sheet/metal
+
+/obj/structure/extinguisher_cabinet/New(turf/loc, ndir = null)
+	..()
+	if(ndir)
+		pixel_x = (ndir & EAST|WEST) ? (ndir == EAST ? 28 : -28) : 0
+		pixel_y = (ndir & NORTH|SOUTH)? (ndir == WEST ? 28 : -28) : 0
 
 /obj/structure/extinguisher_cabinet/Destroy()
 	QDEL_NULL(has_extinguisher)
@@ -23,13 +30,35 @@
 			to_chat(user, "<span class='notice'>You place [O] in [src].</span>")
 		else
 			opened = !opened
+	else if(istype(O, /obj/item/weldingtool))
+		if(has_extinguisher)
+			to_chat(user, "<span class='warning'>You need to remove the extinguisher before deconstructing the cabinet!</span>")
+			return
+		if(!opened)
+			to_chat(user, "<span class='warning'>Open the cabinet before cutting it apart!</span>")
+			return
+		var/obj/item/weldingtool/WT = O
+		if(!WT.remove_fuel(0, user))
+			to_chat(user, "<span class='notice'>You need more welding fuel to complete this task.</span>")
+			return
+		to_chat(user, "<span class='notice'>You begin cutting [src] apart...</span>")
+		playsound(loc, WT.usesound, 40, 1)
+		if(do_after(user, 40 * WT.toolspeed, 1, target = src))
+			if(!src ||!opened || !WT.isOn()) // !src to prevent it being duped
+				return
+			visible_message("<span class='notice'>[user] slices apart [src].</span>",
+							"<span class='notice'>You cut [src] apart with [WT].</span>",
+							"<span class='italics'>You hear welding.</span>")
+			var/turf/T = get_turf(src)
+			new material_drop(T)
+			qdel(src)
 	else
 		opened = !opened
 	update_icon()
 
-
 /obj/structure/extinguisher_cabinet/attack_hand(mob/user)
 	if(isrobot(user) || isalien(user))
+		to_chat(user, "<span class='notice'>You don't have the dexterity to do this!</span>")
 		return
 	if(ishuman(user))
 		var/mob/living/carbon/human/H = user

paradise.dme

@@ -807,6 +807,7 @@
 #include "code\game\objects\items\mountable_frames\air_alarm.dm"
 #include "code\game\objects\items\mountable_frames\apc_frame.dm"
 #include "code\game\objects\items\mountable_frames\buttons_switches.dm"
+#include "code\game\objects\items\mountable_frames\extinguisher_frame.dm"
 #include "code\game\objects\items\mountable_frames\fire_alarm.dm"
 #include "code\game\objects\items\mountable_frames\frames.dm"
 #include "code\game\objects\items\mountable_frames\intercom.dm"