Interesting update, though I'm wondering why cargo works with "volume units" when it's actually based on mass. Seems like an easy way to confuse people since the cargo volume is not actually equal to the volume that blocks occupy in game. I have seen the config entries that allow you to change the "volume" independently of mass, but to call it volume just seems weird.
It could be possible that eventually they'll give every item a volume, and that they're just using mass as a place-holder.
Each block has its volume set as mass currently as default, we're planning to give each block its own volume but that's for the next release. Cargo is new and it depends on feedback on how we'll change volume numbers.
The cargo system does use volume, and the mass added to your ship is currently 0.1 * volume used. This factor is most likely going to change, all depends on the feedback we get on it.
[DOUBLEPOST=1449316168,1449315298][/DOUBLEPOST]Small ships often don't have a lot of volume inside, we're talking about 60-70% not functional blocks (like hull, decoration) and only 40-30% system blocks (power, thrust, weapons, shields,...).
It's the opposite for "Big" ships, they have way more volume compared to the blocks used for its outer skin. I've seen big, heavily armored ships with a thick outer skin that still have 85% system blocks and 15% non functional ones. At this point big ships can also switch over to external reactors, it gives them great power regen but in turn makes their ship more vulnerable once their shields are down (shoot the reactors and bam, there goes your entire power regen).
That's why power scales so much better at the beginning, to level that out and to make smaller ships actually work well.
The issue we've seen for a long time is that, when certain ship sizes require about 2 mil power regen or a bit more to function well relative to its smaller and bigger counterparts. They would have a *lot* of wasted blocks since power regen was completely linear for that time.
It basically made every ship of that size completely useless, you're better off making a bigger ship, or stick with multiple smaller ships.
Now because power regen still scales well till 2 million, that issue should be resolved. After that point ships usually have enough volume to allow external, on-board reactors.
Obviously this also buffed external reactors but those reactors can be easily re-balanced by tweaking the power supply blocks. How much this is going to change depends on feedback and play testing. Ideally we just need to tweak it without you requiring to change anything on your existing reactors.
I think we can all agree though that changing the same values constantly up and down for every release, is going to be a bad idea so we have to keep that in mind. No one wants to rebuild their ships every 2 weeks.