Build has been updated:

The compartment wall between the bridge and the life support room has been reinforced. (Thanks Sandokhan for the suggestion)

Also replaced some of the clutter in front of the initial core's location with combat steel blocks, to provide an extra barrier. Further reinforced the blocks in any direction radiating out from the initial core's location. For those who prefer not to move the core, and rather keep a forward location, this should be a noticeable resistance increase to being cored.

Corrected the missing blocks at the forward wing expansion section, of the starboard side wing (Thanks Nektraal).