Damn! I don't have the spinstyle notes on my laptop!!! (or anything else Spring*).
Regarding the misc weight stuff, it is in the notes so for me it was just a matter of copy/paste. The 1st class weights idea seemed obvious when I was looking a bit more into ocean liners.
Regarding the crew, IIRC the notes indicate that it as well as the damage values need to be divided by 10 for non-military vessel. I have looked at it in the past and I was not entirely sure about that as you need more people for the various jobs aboard an ocean liner than aboard a cargo ship. I'm not 100% sure about it, but perhaps something like 25-50% of the value that SS gives.
edit: Two things...
1) IIRC, dividing the damage values by 10 means that you need less than 1 non critical hit torpedo to sink an ocean liner. You probably need a bit more than that.
2) Looking at your sim, the accomodation figures I use are based on those of Titanic. They do not have to apply to other vessels, but since what I foud about Titanic's gave a good idea regarding the rough class ratio as well the the beth division so to me it was good enough to use as a base.