Hi, I was the primary translator for the first 13 chapters.
I've actually had access to rips of all digital tankoubon raws for this series (currently up to chapter 91 in volume 5) since last year and into the foreseeable future. Please don't tear your hair out trying to find older raws - they exist, and in fact in higher resolution than the web version.
As for why they have not been uploaded here, we've had legal concerns about uploading digital rips. See Danbooru's Uploading Guidelines:
Generally Rejected
Manga from big-name international publishers.
The web version was probably approved because they are published publicly, but the digital tankoubon is a paid product from various online manga readers. I would appreciate it if someone could contact moderation (I do not know the proper channels) and get a ruling on whether uploading rips here would be permitted.
For those interested, I've translated through chapter 35 - you should be able to find it through some google-fu. There are some Chinese typesets as well.
EDIT: Ruling received, we're good to go.
Updated
Combined Fleet, Surface Task Force,
First Fleet flagship Kirishima!Second Fleet flagship, Fubuki!Abyssal Flagship
Heavy Cruiser Princess
HP 350Operation Sho-4, commence!
Sho-4 was the codename of a Japanese defensive plan for the Hokkaido region