How to convert this properly to mesh with low size, layers names, materials? I tried everything export as obj itp.Results are bad and model is too heavy.
Well, I would first have a read here on mesh settings. Then I would choose one of your “console” objects and try different settings with the Mesh command to see what the “coarsest” setting is that might work for you visually. Then try exporting that one object and see if the file size is acceptable. If you find a setting that is OK, then mesh the whole thing with that setting and export.