I bet at launch there is only 1 battery choice and only RWD, as we know. Then I bet they bundle a lot of upgrades into a single, or perhaps 2, performance or convenience packages. Greatly simplifies everything, seems to show less customization, yet that doesn't mean that certain features won't be available in the large bundle(s).
I'll go with:
1 Battery (large first)
1 RWD
7 Paint
3 Convenience packages (basic, upgraded [white interior], upgraded [black interior])
2 Performance packages (basic, upgraded)
2 Wheel sizes
84.