Sounds good, and no worries about getting it done fast, take your time! Everyone starts somewhere! :)
Yeah it would be nice if Nauvis could for example get snow, lightning strikes, and rain mixed in too on different days! The lightning strikes would functionally be cosmetic since you can't use lightning collectors outside Fulgora anyway. Though that does open up the opportunity for other mods to enable them on nauvis!
I don't know how much will be possible to do, but I think it would also be cool if it integrated with Alien Biomes mod, so the weather effects could be dependent on the biomes you're in.