NGL:
To explain my thoughts on the specific liquid carrier is motion, dry goods (grains, seeds, ore) once put in place tend to stay in place. People, while normally moving do not take up the high density mass of other cargo types. Liquids, however, have a bad habit of constantly moving around and having high densities. Hence the creation of baffle plates in larger liquid carrying objects, the retard the motion and preventing the slosh effect*.
In my train of thought, liquid carriers would have specially built hulls, and additional IDF generator to prevent such actions from tearing a lightly built (i.e. non-combat design) ship apart.
* = if your unsure what a slosh effect is, take a two liter bottle, half full with a liquid. Lay it on it's side, and move it along the long axis a few inches/centimeters, then stop quickly. You'll notice the liquid suddenly moves to the forward end, then back to the other side, this will repeat a few times. Take note of the tugging sensation when the wave reaches one of the bottles ends.
NSP:
I like the Nantional concept as well. My thoughts are the Science part should be retained as not all missions are ment to survay anything. Probe, I keep thinking unmaned with that term, something with a living crew IMO is not a probe.
Phoenix...
"I'm not saying there should be capital punishment for stupidity,
but maybe we should just remove all the safety lables and let nature take it's course"
"A Place For Everything & Nothing In It's Place"