Depends on what you mean by “finishing details”. It is good practice to “fake” as much as possible. If a cupboard isn’t going to be used for manufacture it can simply be a facade, maybe textured without geometry if it has intricate doors, and in that case the finishing details would be in the image.
How many scenes is too many? I commonly use 20+ sometimes up to 50, with several which are temporary for quick referencing between work areas. Scenes don’t cost anything and keep me organised.
You can break up a complex design into separate drawings and work between files using copy / paste in place to move common elements between drawings. You just need to have a protocol to ensure which is the latest. Having good hierarchy in your Outliner is important.
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