Xodusprime, you were wondering about the distances between planets.
1 Void Unit is about 10 000 kilometres, as of RT book p.213.
This gives us all the information we need. Therefore, one Terra-sized planet roughtly fills on VU (Radius ~6300 km).
Terra (Earth) is about 150 000 000 km from the sun. This distance, is one AU, and is 1500 VU. (and as a sidenote, it takes aprox. 8 minutes to travel with the speed of light)
Radius of the Sun is 700 000 000 KM ~ 4.6 VU.
Mercury: 0.4 AU ~ 600 VU
Venus: 0.7 AU ~ 1050 VU
Mars: 1.5 AU ~ 2250 VU
Asteroid Belt: 2.3 - 3.3 AU (3450 VU - 4950 VU)
Jupiter: 5.2 AU ~ 7800 VU
Saturn: 9.5 AU ~ 14250 VU
Uranus: 19.5 AU ~ 29250 VU
Neptune: 30 AU ~ 45000 VU
That should give your a rought estimate how big starsystems should be. and given the daily travel amount of ships (Speed x48), it takes a while to reach the habitable planets from outside of the system (as some fluff says that you can't warp in to gravity fields or something..).
Also, I suggest you to read this: en.wikipedia.org/wiki/Kepler's_laws_of_planetary_motion . There is a simple formula used to calculate the distances between planets.