Porting the BEPIS research machinery. (#12277)

* Initial B.E.P.I.S port.

* All nodes but sticky tape are in. Sweet.

* Mapping the BEPIS :DDD

* ah

* deers.

code/game/objects/structures/lattice.dm

@@ -149,3 +149,30 @@
 		pixel_x = 0
 		pixel_y = 0
 	return TRUE
+
+/obj/structure/lattice/lava
+	name = "heatproof support lattice"
+	desc = "A specialized support beam for building across lava. Watch your step."
+	icon = 'icons/obj/smooth_structures/catwalk.dmi'
+	icon_state = "catwalk"
+	number_of_rods = 1
+	color = "#5286b9ff"
+	smooth = SMOOTH_TRUE
+	canSmoothWith = null
+	obj_flags = CAN_BE_HIT | BLOCK_Z_FALL
+	resistance_flags = FIRE_PROOF | LAVA_PROOF
+
+/obj/structure/lattice/lava/deconstruction_hints(mob/user)
+	return "<span class='notice'>The rods look like they could be <b>cut</b>, but the <i>heat treatment will shatter off</i>. There's space for a <i>tile</i>.</span>"
+
+/obj/structure/lattice/lava/attackby(obj/item/C, mob/user, params)
+	. = ..()
+	if(istype(C, /obj/item/stack/tile/plasteel))
+		var/obj/item/stack/tile/plasteel/P = C
+		if(P.use(1))
+			to_chat(user, "<span class='notice'>You construct a floor plating, as lava settles around the rods.</span>")
+			playsound(src, 'sound/weapons/genhit.ogg', 50, TRUE)
+			new /turf/open/floor/plating(locate(x, y, z))
+		else
+			to_chat(user, "<span class='warning'>You need one floor tile to build atop [src].</span>")
+		return