On the topic of the Mars, I would imagine that the cost of its Improved Tracking System should be reduced to 10 pts.
Comparing a Mars + ITS + Extra Turret (285 pts) to a Dominion with NC (not an option, but assume +20 pts for a total of 275 pts) we have a difference of 10 pts in cost and the left shifted WBs vs the lances. At >30cm range this will typically still favour the lances and even when <30cm it will generally still favour the lances because of the ceiling effect (you can't shift further left than the defences column) and also because the Mars is unlikely to LO, which typically favours WBs when all else is equal (ie, 3d6 hitting on 5+ = 2d6 hitting on 4+ normally, but is greater when on LO).
Dropping the cost of this upgrade down to 10 pts makes it only 5 pts more expensive than a NC Dominion would be, and this should more than adequately cover any beardiness of the rule. In fact, it probably isn't even worth 10 pts on the Mars.
For convergent evidence we can look at the Overlord. The Overlord with the ITS is, I think, widely held to be balanced. The Mars has only 75% of the upgradeable direct fire weaponry of the Overlord. 75% of 15 pts would be 11.25 pts. However, the weaponry is also only 75% of the range, which would be 8.44 pts. Perhaps this last should not be weighed so highly, since most of game is spent sub-30cm, but if the Mars had longer range WBs it would spend a greater proportion of the game at longer range (approaching obliquely) and the Overlord also tends to hang back similar to a Carnage, extending the usefulness of its range. Add to this the fact that the Mars is far more likely to be reloading rather than locking on and the comparative value of the left-shift goes down even further (nearer 5 pts than 10 pts).
So I really think that 10 pts is sufficient cost for the ITS on the Mars.