Oh rly ?? and just how are you gonna manage to get such a ship behind the enmy lines.
How about all those nice new stealth technologies you were talking about? How about that post you made on how it's hard to find ships behind your lines? You're contradicting yourself to argue against my points. 
In order for it to be able to handle itself in a prelogued battle it would have to sacrifice firepower and speed and stealth.
Your words:
I honestly do not understand why all this fuss about reducint the ships HP to about 20 k points ! Why would you have to reduce them that much .
I mean the Iceni proved you can make a ship with the HP of a destroyer class vessel and still have high speed and more then enough beam firepower.
Just do the same only more powerfull reactors (vasudan ones) meaning higher speeds withouth sacrificing armour .
Sure you could argue that you will need at some point to lighten the ship but that would mean reducing the armour by 10 or 20 k points not 70 k
A ship with 80k would be able to handle itself. Right here you argued that the Iceni would be well suited to a hunter-killer role with a bit of modernization. I'm saying it would be better suited to conducting prolonged hit-and-fade engagements. We're talking about the exact same ship.
I honestly believe you dont quite get the concept of stealth hunter-killer do you ??
I stated in my previous post a ship like that [modern Icini] would not be as well suited as a hunter-killer. You sure I'm the one that doesn't understand the concept?
A hunter-killer is a ship designed to combine both the sensor/detection and killing into a single vessel. A FreeSpace destroyer-sized vessel is not well suited to that roll, at least how I see it. Like I said in my post on a previous page -the idea of hunter-killer makes more sense put into context of submarine warfare and wolfpack tactics. What do navies send when they want to hunt down enemy shipping? A frigate/submarine, or a battleship?
A ship the size of a FreeSpace Destroyer might be able to accomplish it.. but here we come back to the cost vs. utility aspect. No navy in their right mind is going to spend the money on an destroyer that can't fight in prolonged engagements. And if it can, look at what you have... a modernized (and more expensive) Orion/Hecate.
So you are comparing a barely 1 km long warship to a 2.2+ km long destroyer several times the volume dimensions etc.
Rrrrright......!
Also the 70 k points are a trade off for better speed. I mean we see the Iceni at 90 k points just 10 k short o the Hecate and Orion HP managing 35 m/s !
So in order for it to have 40m/s at least 3/4 Bgreens and several aaaf weapons it has to give away something. so 20 k points seem like a logical conclusion.
20 k points means it wouldnt be able to take a hit from even a cruiser .
I mean i know it has to take out the target fast but that doesnt mean it wont take a few hits . sure there wont be too many hits but if its HP is too low then it will just be for nothing.
Also you do know that a ship's HP is made of more then just the armor. Its made of the armor around its engines weapons subsystems etc.
Also WE DO KNOW that in the game universe an in real life for that matter you CAN NOT track down a ship even a 2+km long warship that easy .
I mean you could hide sush a shop behind a large asteroid or a moon or on the ourskirts of the solar sistem .
Rest assured that such a ship woul pay or its price the second it manages to take out a Ravana and a Lilith cruiser.
I mean the GTVA lost i believe 3 or 4 warships to a single Ravana . By making a ship that costs just as much as all those 4 warships put toghether but can survive enough to take out 1 Ravana and a Lilith minimum you are in the win. sort of. Well not really but you get my point.
Such a ship can send out one or 2 wings on a scouting mission for targets . Then when the target is found go in fast fire the beams once or twice and get the hell out before reinforcement arrive.
some good com's and sensor jamming should also provide enough cover so as not to be able give away who did it !