Mike-O, while aesthetically I think that would complement the red base... the theme of the map is indeed winter, and Lava would seem very very out of place.
However, I do agree with your point about the ceiling lights. It is a nitpicky detail but perhaps a "cooler" (as in temperature) type of light texture would fit better with the theme of the map?
Overall, great look from the screenshots. I'll have to download it when I have some more free time.
Keep it up Chem, and let's see that waterfall tutorial

(oh this is Buckshot Enema by the way)