You know? Now that this is become a topic? I'm imagining this in my head. What it might look like in real life. Imagine you have a Python 1, which has an insane amount of class 5 and class 6 slots (rooms) and can hold almost twice as much as that of a Clipper, which is a Large ship. Now, imagine you've take the crew quarters, restrooms, cargo rooms (all the open rooms) and filled them in with solid metal, to strengthen the ship. That's what you basically done. You've taken a class 5 slot (a room/ compartment) and traded it for an equal portion of solid alloys. If the room could hold 32 tons? You've just filled it with 32 tons of metal

More, If you consider heavy duty engineering, which implies that you've now used all available space in that room, that not even air can exist in anymore.
Like, how do you even get into your bridge?

You can't walk through the cargo bay or crew quarters anymore. I imagine you use the vent shafts...if those aren't also filled in.