more work

hyperstation/code/modules/resize/resize_action.dm

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+//This action is technically a duplicate of /action/small_sprite
+//However, we do our own things...
+
+/datum/action/sizecode_resize
+	name = "Toggle Giant Sprite"
+	desc = "Others will continue to see you giant."
+	icon_icon = 'icons/mob/screen_gen_old.dmi'
+	button_icon_state = "health1"		//You can change this if you want
+	background_icon_state = "bg_alien"	//But keep this as a distinct background
+	var/small = FALSE
+	var/image/small_icon
+
+/datum/action/sizecode_resize/Grant(mob/M, safety=FALSE)
+	if(ishuman(M) && !safety)	//this probably gets called before a person gets overlays on roundstart, so try again
+		if(!LAZYLEN(M.overlays))
+			addtimer(CALLBACK(src,PROC_REF(Grant), M, TRUE), 5)	//https://www.youtube.com/watch?v=QQ-aYZzlDeo
+			return
+
+	..()
+	if(!owner)
+		return
+	var/image/I = image(icon=owner.icon,icon_state=owner.icon_state,loc=owner,layer=owner.layer,pixel_x=owner.pixel_x,pixel_y=owner.pixel_y)
+	I.overlays += owner.overlays
+	I.override = TRUE
+	small_icon = I
+
+/datum/action/sizecode_resize/Trigger()
+	..()
+	if(!small)
+		owner.add_alt_appearance(/datum/atom_hud/alternate_appearance/basic, "sizecode_smallsprite", small_icon)
+	else
+		owner.remove_alt_appearance("sizecode_smallsprite")
+	small = !small
+	return TRUE