Cherrypicking vox spike throwers, made crossbows and pneumatic cannons constructable.

code/modules/projectiles/guns/projectile/bow.dm

@@ -202,4 +202,88 @@
 		A.removed(user)
 		arrow = null
 		tension = 0
-		icon_state = "crossbow"
+		icon_state = "crossbow"
+
+// Crossbow construction.
+
+/obj/item/weapon/crossbowframe
+	name = "crossbow frame"
+	desc = "A half-finished crossbow."
+	icon_state = "crossbowframe0"
+	item_state = "crossbow-solid"
+
+	var/buildstate = 0
+
+/obj/item/weapon/crossbowframe/update_icon()
+	icon_state = "crossbowframe[buildstate]"
+
+/obj/item/weapon/crossbowframe/examine()
+	..()
+	switch(buildstate)
+		if(1) usr << "It has a loose rod frame in place."
+		if(2) usr << "It has a steel backbone welded in place."
+		if(3) usr << "It has a steel backbone and a cell mount installed."
+		if(4) usr << "It has a steel backbone, plastic lath and a cell mount installed."
+		if(5) usr << "It has a steel cable loosely strung across the lath."
+
+/obj/item/weapon/crossbowframe/attackby(obj/item/W as obj, mob/user as mob)
+	if(istype(W,/obj/item/stack/rods))
+		if(buildstate == 0)
+			var/obj/item/stack/rods/R = W
+			if(R.amount >= 3)
+				R.use(3)
+				user << "\blue You assemble a backbone of rods around the wooden stock."
+				buildstate++
+				update_icon()
+			else
+				user << "\blue You need at least three rods to complete this task."
+			return
+	else if(istype(W,/obj/item/weapon/weldingtool))
+		if(buildstate == 1)
+			var/obj/item/weapon/weldingtool/T = W
+			if(T.remove_fuel(0,user))
+				if(!src || !T.isOn()) return
+				playsound(src.loc, 'sound/items/Welder2.ogg', 100, 1)
+				user << "\blue You weld the rods into place."
+			buildstate++
+			update_icon()
+		return
+	else if(istype(W,/obj/item/weapon/cable_coil))
+		var/obj/item/weapon/cable_coil/C = W
+		if(buildstate == 2)
+			if(C.amount >= 5)
+				C.use(5)
+				user << "\blue You wire a crude cell mount into the top of the crossbow."
+				buildstate++
+				update_icon()
+			else
+				user << "\blue You need at least five segments of cable coil to complete this task."
+			return
+		else if(buildstate == 4)
+			if(C.amount >= 5)
+				C.use(5)
+				user << "\blue You string a steel cable across the crossbow's lath."
+				buildstate++
+				update_icon()
+			else
+				user << "\blue You need at least five segments of cable coil to complete this task."
+			return
+	else if(istype(W,/obj/item/stack/sheet/mineral/plastic))
+		if(buildstate == 3)
+			var/obj/item/stack/sheet/mineral/plastic/P = W
+			if(P.amount >= 3)
+				P.use(3)
+				user << "\blue You assemble and install a heavy plastic lath onto the crossbow."
+				buildstate++
+				update_icon()
+			else
+				user << "\blue You need at least three plastic sheets to complete this task."
+			return
+	else if(istype(W,/obj/item/weapon/screwdriver))
+		if(buildstate == 5)
+			user << "\blue You secure the crossbow's various parts."
+			new /obj/item/weapon/crossbow(get_turf(src))
+			del(src)
+		return
+	else
+		..()

code/modules/projectiles/guns/projectile/pneumatic.dm

@@ -20,6 +20,9 @@
 	var/force_divisor = 400                             // Force equates to speed. Speed/5 equates to a damage multiplier for whoever you hit.
 	                                                    // For reference, a fully pressurized oxy tank at 50% gas release firing a health
 	                                                    // analyzer with a force_divisor of 10 hit with a damage multiplier of 3000+.
+/obj/item/weapon/storage/pneumatic/New()
+	..()
+	tank_container.tag = "gas_tank_holder"
 
 /obj/item/weapon/storage/pneumatic/verb/set_pressure() //set amount of tank pressure.
 
@@ -138,3 +141,82 @@
 	spawn(cooldown_time)
 		cooldown = 0
 		user << "[src]'s gauge informs you it's ready to be fired again."
+
+//Constructable pneumatic cannon.
+
+/obj/item/weapon/cannonframe
+	name = "pneumatic cannon frame"
+	desc = "A half-finished pneumatic cannon."
+	icon_state = "pneumatic0"
+	item_state = "pneumatic"
+
+	var/buildstate = 0
+
+/obj/item/weapon/cannonframe/update_icon()
+	icon_state = "pneumatic[buildstate]"
+
+/obj/item/weapon/cannonframe/examine()
+	..()
+	switch(buildstate)
+		if(1) usr << "It has a pipe segment installed."
+		if(2) usr << "It has a pipe segment welded in place."
+		if(3) usr << "It has an outer chassis installed."
+		if(4) usr << "It has an outer chassis welded in place."
+		if(5) usr << "It has a transfer valve installed."
+
+/obj/item/weapon/cannonframe/attackby(obj/item/W as obj, mob/user as mob)
+	if(istype(W,/obj/item/pipe))
+		if(buildstate == 0)
+			user.drop_item()
+			del(W)
+			user << "\blue You secure the piping inside the frame."
+			buildstate++
+			update_icon()
+			return
+	else if(istype(W,/obj/item/stack/sheet/metal))
+		if(buildstate == 2)
+			var/obj/item/stack/sheet/metal/M = W
+			if(M.amount >= 5)
+				M.use(5)
+				user << "\blue You assemble a chassis around the cannon frame."
+				buildstate++
+				update_icon()
+			else
+				user << "\blue You need at least five metal sheets to complete this task."
+			return
+	else if(istype(W,/obj/item/device/transfer_valve))
+		if(buildstate == 4)
+			user.drop_item()
+			del(W)
+			user << "\blue You install the transfer valve and connect it to the piping."
+			buildstate++
+			update_icon()
+			return
+	else if(istype(W,/obj/item/weapon/weldingtool))
+		if(buildstate == 1)
+			var/obj/item/weapon/weldingtool/T = W
+			if(T.remove_fuel(0,user))
+				if(!src || !T.isOn()) return
+				playsound(src.loc, 'sound/items/Welder2.ogg', 100, 1)
+				user << "\blue You weld the pipe into place."
+				buildstate++
+				update_icon()
+		if(buildstate == 3)
+			var/obj/item/weapon/weldingtool/T = W
+			if(T.remove_fuel(0,user))
+				if(!src || !T.isOn()) return
+				playsound(src.loc, 'sound/items/Welder2.ogg', 100, 1)
+				user << "\blue You weld the metal chassis together."
+				buildstate++
+				update_icon()
+		if(buildstate == 5)
+			var/obj/item/weapon/weldingtool/T = W
+			if(T.remove_fuel(0,user))
+				if(!src || !T.isOn()) return
+				playsound(src.loc, 'sound/items/Welder2.ogg', 100, 1)
+				user << "\blue You weld the valve into place."
+				new /obj/item/weapon/storage/pneumatic(get_turf(src))
+				del(src)
+		return
+	else
+		..()