Finally got around to something I'd thought about before Alpha - testing an idea for doing double+ thick hulls. It had occurred to me that, since the "Hull Wall" and "Hull Wall Corners" had the same Armor and HP as a "Hull Block," but 1/3 the mass they wouldn't weigh the ship down as much. As an added benefit, walls set up like this would leave a corridor inside, which could be useful for damage control and maintenance. If that's not enough, you can paint the inner wall with a machinery/neon...
Experiment in Double Hulls
Experiment in Double Hulls