Vehicle parts pack. Attempt 3.

1. Metal wheel + recipe.
2. Chitin vehicle armor + recipe.
3. Bone vehicle armor + recipe.
4. Add tiny storage space to doors. (Typical car doors usually contain
space in which you can put some stuff.)
5. Wooden seat.
6. Wooden spike.
7. Wooden door.
8. Wooden roof.
You might change this to gray--otherwise there's no indication that your armor is broken. (Same for the chitin.)

More to the point, the only reasons anyone would use the bone armor over the chitin armor seem either Looks or lack of other armor supplies: it's tougher to make, takes more materials, weighs more, and is less protective.  That intended?