Ahoy Mr. Gibson, while trying to make a Terran Federation Navy light cruiser I came across some oddities.

The first part involves not being able to make a network (see first picture). So, I just extruded a curve into a 2D sheet thing, then extruded that downward.



I then tried to diff that shape out of the main hull, but the hull vaporized instead (see second and third pictures).









Any hints? I can probably stumble onto some workarounds, but was curious as to your opinions.