Fix eyes on custom/xenochimera not respecting the icon base selection

Now you can be custom/xenochimera of other species without fucking up the eyes!

modular_chomp/code/modules/mob/living/carbon/human/species/species.dm

@@ -1,3 +1,27 @@
-/datum/species
-	var/crit_mod = 1
-	var/vore_belly_default_variant = "H"
+/datum/species
+	var/crit_mod = 1
+	var/vore_belly_default_variant = "H"
+
+// Handles non-standard eyes when using a species that utilizes a custom base icon set.
+// Eye data is stored in the head organ, and this needs to be handled specially.
+/datum/species/proc/handle_base_eyes(var/mob/living/carbon/human/H, var/custom_base)
+	if(selects_bodytype && custom_base) // only bother if our src species datum allows bases and one is assigned
+		var/datum/species/S = GLOB.all_species[custom_base]
+
+		//extract default eye data from species datum
+		var/baseHeadPath = S.has_limbs[BP_HEAD]["path"] //has_limbs is a list of lists
+
+		if(!baseHeadPath)
+			return // exit if we couldn't find a head path from the base.
+
+		var/obj/item/organ/external/head/baseHead = new baseHeadPath()
+		if(!baseHead)
+			return // exit if we didn't create the base properly
+
+		var/obj/item/organ/external/head/targetHead = H.get_organ(BP_HEAD)
+		if(!targetHead)
+			return // don't bother if target mob has no head for whatever reason
+
+		targetHead.eye_icon = baseHead.eye_icon
+		targetHead.eye_icon_location = baseHead.eye_icon_location
+	return