final pass

it compiles and i've had enough, someone else can probably figure it out from this point onwards

_maps/RandomRuins/SpaceRuins/bigderelict1.dmm

@@ -410,59 +410,23 @@
 	name = "Security Checkpoint";
 	req_access_txt = "63"
 	},
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bz" = (
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bA" = (
 /obj/structure/alien/weeds/creature,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bB" = (
 /obj/effect/decal/cleanable/cobweb/cobweb2,
 /obj/structure/table,
 /obj/machinery/recharger,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bC" = (
@@ -549,61 +513,25 @@
 "bQ" = (
 /obj/structure/filingcabinet,
 /obj/machinery/light/directional/west,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bR" = (
 /obj/item/shard,
 /obj/structure/alien/weeds/creature,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bS" = (
 /obj/item/chair,
 /obj/structure/alien/weeds/creature,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "bT" = (
 /obj/effect/decal/cleanable/blood/old,
 /obj/structure/alien/weeds/creature,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /obj/machinery/button/door/directional/south{
 	id = "bigderelictcheckpoint";
 	name = "security checkpoint control"
@@ -685,16 +613,7 @@
 /obj/structure/window/reinforced{
 	dir = 1
 	},
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "cg" = (
@@ -706,16 +625,7 @@
 /obj/structure/table_frame,
 /obj/item/stack/sheet/iron,
 /obj/item/stack/sheet/plasteel,
-/obj/effect/turf_decal/tile/red{
-	dir = 1
-	},
-/obj/effect/turf_decal/tile/red,
-/obj/effect/turf_decal/tile/red{
-	dir = 4
-	},
-/obj/effect/turf_decal/tile/red{
-	dir = 8
-	},
+/obj/effect/turf_decal/tile/red/fourcorners,
 /turf/open/floor/iron/dark,
 /area/ruin/space/has_grav/derelictoutpost)
 "ch" = (