How-To Hide anything that enters a certain area/space/volume?

Well try playing with the Visibility variable

Basic Example here
Create a cube mesh in the lvl then click on it and on the Details pane (on the right) uncheck visibility
Create a trigger box in front of it
Right click on the trigger box and at the bottom choose set Event and choose OnActorBeginOverlap
It will open your Lvl Blueprint
OnActorBeginOverlap Set visibility on the target Cube and check the new visibility box
then
OnActorEndOverlap Set visibility on the target Cube and uncheck the new visibility box

This way the cube will appear when the actor walk over the trigger box and will disappear when the actor walk out of the trigger box (your entire ship could be the trigger box)

Like this (I suck at explaining)

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You can then work from that and try to create what you want… very basic stuff but thats all I have