Engineering a lightweight hull for heavy duty and deep plating - as you haven't - would yield 462 absolute hitpoints, 337 explosive, 393 kinetic, and 472 thermal.
Good to know. If I had completed that (I only have 1) I would probably be still hanging around where everything is named Wredguia. Last landing on a high gravity planet did not do any good for may already weakened hull. Limping back "home".
BTW, searching for the closest anything with a repair shop, 3 out of 3 FC had already left the system. Nobody in sight.