Hi and good luck on your project.
We have a '94 30 foot and even though ours is a little different configuration (with the shower on the opposite side of the isle) I believe, in part 2 of your question, you are referring to the carpeted, step-type (at least in ours) affair, below the vanity, between it and the floor.
This past winter, we laid laminate flooring from the front gaucho, through the kitchen, and on into the bath. For fear of potential water damage, we seperated the bath flooring from the kitchen area with a threshold, so that we could easily replace the flooring, in the event of a bad leak.
When we got to the "step" area referred to above, we were tempted to leave it alone as it was very much "out of square". The carpet on it was heavliy stapled and took a bit of time to get off. After we got all the carpet off, and took out the plywood underneath, we found that it was covering various lengths of plumbing (drain pipes, etc.). We ended up using left-over scraps of the laminate & rebuilding the section altogether.
Hope this helps you a little in your quest.