(lineart comes from the Cosmic Era Mechanic & World artbook, edited by me. Automated translation, which I tried to copy-edit into something legible).
The Japanese Wikipedia article on the Cosmic Era's vehicles has the official weapon stats. HOWEVER, there's a footnote in the article. The key part reads:
Wikipedia (JA) wrote:「体のどの部分なのか定かでないため、存在自体が疑わしく誤植の可能性が高い。」
I would've thought that the circles on the sides of the Nazca-class might be the VLS, but those look more like airlocks for MS than any sort of weapon.Automated translation of the above wrote:"Since it is not clear on which part of the hull it is located, its very existence is doubtful, with a high possibility of this being a typographical error."
Another inconsistency is the huge size difference between the Laurasia's railgun turrets. According to the specs, they are all supposed to be of the same caliber (450mm), yet the centerline turret looks considerably larger.