The Shard wouldn't work unless we recruited some Killiks which would then make us all joiners and that's a whole different story line that I personally don't have any interest in playing out
The Hammerheads would work but would need significant upgrades to bring them up to date and it would no longer be classified as a Cruiser, it would be a Frigate given it's length. I'll see if I can't put something together for it.
Not familiar with the Valor class but I'll read it over, no doubt it will require some upgrades as well, that would handle the core of our fleet but we would need to identify something as a heavy cruiser as well as appropriate fighters/bombers/interceptors.
We would likely want some form of Star Destroyer amongst it all, their design is rather useful when it comes to head to head combat being able to bring all their guns to bear on a target is rather useful though there are advantages to not having every weapon directed on a target. We would also probably want some sort of actual command ship but I would figure we would want to design our own there.
Also we would want a Corvette of some sort I would figure
this would be an appropriate choice if we want to be "true to the roots"
Found what could be an upgraded Star Destroyer Class
here