Congrats on the final build!
That stinks that you may not receive it with the vinyl floor covering as you desired!!!
I can't help you with your first or last question, but concerning the dealer add-ons you're asking about I can tell you this. First, a dealer would not sell it unless they made some profit off of it. I'm not saying that dealers only sell things that earn a profit all the time...but most of the time they need to make a profit when they sell a warranty or add-on or used/new car, otherwise they wouldn't be able to stay in business. Now, my viewpoint is that if I take care of my vehicle exactly as the manufacturer's maintenance schedule suggests, then I shouldn't need any of the dealer add-ons, at the same time some are obviously nice like the rustproofing and fabric protectors. What I would suggest is this, if after thinking of the pros and cons you decide that you do want some of the dealer add-ons, shop around. It turns out that many dealer add-ons can be purchased from other dealers. By shopping around you can use competition to get a better price on an extended warranty and some other things. Here is my favorite resource for car shopping knowledge: realcartips.com
However, for your specific question just read this: http://www.realcartips.com/guide/warranties.shtml