primarily because you are looking at a work in progress... the dials, controls switches, intrument faces, crew members, additional piping, and a few other things that will be part of the interior, aren't in the scene pictured...
now i know that modern computers can handle a lot of geometry and all... but when you add all of the above that is not pictured into the scene, well... i don't want to have it so that someone is gonna need to have the latest and greatest mobo and gpu available to run it...
there will be more 'stuff' to see...
--Mike
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