It looks like the design of the Hangar is already prepared for allowing access down to the ship area.
Letting us change ship components directly instead of through the component shelves would be much cooler and immersive. Also this would allow us to tweak the power grid when switching components. The upgrade of components could stay where it is maybe.
You could also let us move supplies to and from the ship manually before/after missions.
Maybe even switch the Ready Up function to just have the crew strap in to get ready for launch.