i don't think it's possible unfortunately, due to how instanced dungeons work <:I sorry!

Aw. Unfortunate =(
Maybe you make a version with a fully functional biome? For people who can't build on planets for various reasons (like me, I can't build on planets due to potato PC, that lags like hell)

unfortunately no; no water will spawn if you dig up the background blocks. i don't fish, so idk if any fish will spawn if you bring your own water in, and i doubt it will.

for balance reasons (these are purely sandboxes, not meant as a replacement for building profitable colonies on planets), i won't be adding any spawns or changing the threat level. my apologies :'D

Also, can you fish in those if you dig up all cloud blocks?

Niiiiiiice! Always dreamed about magical snowglobe, one of those with little island and a palmtree in them, wich you could live in. My hylotl would be so pleased to finaly have his very own little ocean <3