The plans of the Lusitania here reproduced are from "Engineering" (London) in the issue for May 14th, 1915.
I think they are the plans originally published in that magazine when the boat was first put into commission in 1907. The arrangement and number of the lifeboats were changed a few years back and were different from those shown in the plan. On her last voyage there were eleven on each side, slung higher to allow space for the collapsible lifeboats that rested on the deck under the regular lifeboats. Also, this plan does not show the extra collapsible lifeboats that were nested out on the after deck. The launch that is indicated on the plan, I did not see.