Yes, I would 100% advocate planning these things out in advance.(especially your world texel density) This will just make your workflow so much more efficient. Also, building a modular library for your game makes it easier to populate your levels with props that are consistent to the world(but not so consistent as to be…
This really depends on how you will utilise the asset. As you mentioned, you will use parts of it as modular assets and the main part would essentially be a hero asset. So you could split it up like this: the bucket/pipes/timber beams and planks could be reused and might be unwrapped together to a single UV space(but be…