This is bringing back fond memories of the excitement of choosing options and realizing that my camper would be a reality.
My $.02:
I agree with getting rid of the flood lights and using a headlamp. That's because I love dark skies and hate light pollution, especially in camping areas. I have never needed floods for backing into camp or setting up camp. The standard exterior lights are plenty bright. If you use flood lights of any kind, be careful who you camp next to.
I would also not pay extra for the exterior LED package. I would go for the standard fixtures and replace the bulbs with LEDs. However, if the LED option FWC offers is better looking than the standard fixtures, I could be swayed.
I personally would not pay extra for the heavier fiberglass siding. If you go through brush, how will it look after it is scratched? But, aesthetic choices are hard to argue with.
Totally agree with having FWC add the roof racks. If there's a leak, you want it under warranty, definitely.
I don't think you will regret adding the steps. Since you are planning on a roof rack, you must be thinking of eventually carrying stuff on the roof, right? The steps are very handy when lashing gear to the roof, so, might as well have them added now.
I didn't add a solar plug, and that is the one option I wish I had.