We were discussing that issue too, and it seems the consensus is, since we're going to use the "build an empty/broken hull, and fill/fix the components" model (like SE3), it would make sense for repairs, like construction, to use resources, since the two are basically identical.
I know SE3 didn't do it QUITE like that - you paid the entire cost for the hull and all associated components up front, rather than just paying for stuff as it gets built, while repairs were free - but this way seems more consistent
