Small Decorative Blocks/Small Additions DLC?
Small ships need doors, windows, and more decorations to allow better small ships.
1. Small versions of the decorative blocks (add functional door to bathroom block on both large and small)
2. More small blocks like doors and windows (windows wouldn't be 1x1x1 versions, they would be more like 3x3x1/4x4x1/5x5x1)
Small ships should have limitations compared to large ones, but a bit less than the vanilla (like keeping the mid to late game blocks to only large)