Implementing skeletal versions of grindstone and bellows.

code/modules/crafting/forging/bellows.dm

@@ -0,0 +1,13 @@
+/obj/structure/working/bellows
+	name = "bellows"
+	desc = "An air pump used to improve the heat of a furnace."
+	icon = 'icons/obj/structures/forging/bellows.dmi'
+	var/decl/material/bellows_material = /decl/material/solid/organic/leather
+
+/obj/structure/working/bellows/Initialize()
+	bellows_material = GET_DECL(bellows_material)
+	. = ..()
+
+/obj/structure/working/bellows/on_update_icon()
+	. = ..()
+	underlays = list(overlay_image(icon, "[icon_state]-bellows", bellows_material.color, RESET_COLOR))

code/modules/crafting/forging/grindstone.dm

@@ -0,0 +1,16 @@
+/obj/structure/working/grindstone
+	name = "grindstone"
+	desc = "A rotating section of coarse stone used to polish and sharpen metalwork like blades."
+	icon = 'icons/obj/structures/forging/grindstone.dmi'
+	var/decl/material/stone_material = /decl/material/solid/stone/granite
+
+/obj/structure/working/grindstone/Initialize()
+	stone_material = GET_DECL(stone_material)
+	. = ..()
+
+/obj/structure/working/grindstone/on_update_icon()
+	. = ..()
+	underlays = list(
+		overlay_image(icon, "[icon_state]-grindstone", stone_material.color, RESET_COLOR),
+		overlay_image(icon, "[initial(icon_state)]-backdrop")
+	)

code/modules/materials/material_stack_nail.dm

@@ -1,15 +1,16 @@
 /obj/item/stack/material/nail
-	name = "nails"
-	singular_name = "nail"
-	plural_name = "nails"
-	icon_state = "nail"
-	plural_icon_state = "nail-mult"
-	max_icon_state = "nail-max"
-	stack_merge_type = /obj/item/stack/material/nail
+	name                = "nails"
+	singular_name       = "nail"
+	plural_name         = "nails"
+	icon_state          = "nail"
+	plural_icon_state   = "nail-mult"
+	max_icon_state      = "nail-max"
+	stack_merge_type    = /obj/item/stack/material/nail
 	crafting_stack_type = /obj/item/stack/material/nail
-	icon = 'icons/obj/items/stacks/nails.dmi'
-	is_spawnable_type = TRUE
-	matter_multiplier = 0.05 // 20 per standard sheet
+	icon                = 'icons/obj/items/stacks/nails.dmi'
+	is_spawnable_type   = TRUE
+	matter_multiplier   = 0.05 // 20 per standard sheet
+	material            = /decl/material/solid/metal/iron
 
 /obj/item/stack/material/nail/twelve
-	amount = 12
+	amount              = 12

nebula.dme

@@ -2216,13 +2216,15 @@
 #include "code\modules\codex\entries\weapons.dm"
 #include "code\modules\crafting\handmade_fancy.dm"
 #include "code\modules\crafting\handmade_items.dm"
+#include "code\modules\crafting\forging\bellows.dm"
 #include "code\modules\crafting\forging\forge_anvil.dm"
 #include "code\modules\crafting\forging\forge_bars.dm"
 #include "code\modules\crafting\forging\forge_billet.dm"
 #include "code\modules\crafting\forging\forge_fire.dm"
 #include "code\modules\crafting\forging\forge_tools.dm"
 #include "code\modules\crafting\forging\forging_action.dm"
 #include "code\modules\crafting\forging\forging_step.dm"
+#include "code\modules\crafting\forging\grindstone.dm"
 #include "code\modules\crafting\metalwork\metalwork_items.dm"
 #include "code\modules\crafting\pottery\pottery_moulds.dm"
 #include "code\modules\crafting\pottery\pottery_structures.dm"