Colossus had 45 laser turrets, 15 flak guns, 12 missle batteries and 12 beam cannons, right?
That's 72 small turrets and a huge number of GREEN power, though positioned rather ineffectively. Archangel is 1km shorter. God knows about the width and height really.
Now, Colossus stores 60 fighter and bomber wings, which is 240 total ships. I guess you gain some room there if you cut that part out and carry two squads, which would be... 36 fighters?
I don't know where you set the ship to exist, but it's probably do-able in about 10-15 years after the Colossus.
There is only one catch. A ship like the Archangel is a waste of every single resource put into it. So was the Colossus.