I said that artistic approaches [like yours] would make a valuable contribution to FM making in general, it's just that T3Ed will probably have some difficulties with your way of building, at least according to the screenshots.
And of course I've made dozens of rooms already and I'm trying to have an artistic approach as well, in both backstory and design/architecture.
@snobel: Sounds good. I honestly have no idea how an ibt file is composed and how the game handles its content. IIRC the former ibt shrinker worked by stripping original T3 content which was already present in the game (and thus, as I'd imagine, within other ibt files since before JohnP only few textures exist as non-compressed files). I think the increasing amount of custom textures makes saving memory only possible – as you said – when multiple ibt files share the same content. Is it right then that the game extracts all necessary textures (since these are the most memory-eating) at the start?