Lol, this is funny. Your spec is exactly the same like the one I have signed at my dealership, except for the stitching, which I didn't choose. I also picked the black PDLS headlights for the metallic black, plus I chose the bigger fuel tank and Sport chrono of course. That's about it I think, but I got months to change the paint and play with the stitching combinations etc. heart 

Have you considered the red seat belts. It would go nicely with the red stitching, together with the red marker on the steering wheel?

Btw I was very satisfied with the foldable bucket seats in my 997.2 GT3, and I don't know the new 918 bucket seats. How much do they differ, are they more upright? I have yet to try and sit in them and see if I prefer them over the foldable buckets. the latter were quite useful to store some bags behind the seats.