@Calaban
The Blastdoor blocks have multiple purposes.
They are some medium armor.
They have lower triangle count as regular armor blocks
And they are looking diffrent.

About the mass blocks:
This ship is usually stationed on our carrier (as mentioned above).
They are needed for the gravity based launch catapult.

Discovered one of these in my Cataclysm survival/exploration world.

Sorry to say it was unrecognizeable as such a sleek ship (meteor showers every 15 seconds and all), but luckilly the Lg Reactor was still intact enough to pull the model name from its terminal.. before I scrapped it all.

Nice use of Blast Doors on the engine pods.. I'm curious: For looks alone [going for a schick razor look?]? or is it some form up tougher armor plate?

And the mass blocks had me curious as well....?