Just a quick tip if you move the red light into a wall but not all the way it will look flat. Almost like a round window I suggest you try it because it will make the light look cool and you don't have to waste budget to hide it.
Good job with the lava it looks great. I really like playing on this map, it is a hell lot of fun. I already downloaded it
also, if you do another version of this (which you should, this map is great) you might want to improve the looks of the mine carts.