Created my max tier Spirit forge (floor will be replaced with something more suitable once I have a good idea), it wasn't bad - just needed to make space for it.
I think that's the most annoying part of this - everything takes space, but since it's a skyblock that means I need to build out every time. I prefer building off of some structure, like an aether island.
Next step is to use this mod to summon a blaze, and use it to make a blaze burner (which will give me access to gold). Gold is what gates Ars Noveau, and that's my next macro-goal.