Likely this was discussed somewhere else but didn't see it at a glance. What do Invisible God Temples look like.
Are they like Greek or Roman structures or are they more open with breeze-ways? Would there be stylized an Orlanthi window, a bit late then real world at 100AD or so and not high quality but surely the dwarves have glass and gasses, windows and even telescopes? Maybe they use a sorcery spell, wizard's eye or something... but would thee be glass in any temple?