Yeah. Multiple lighting sources so you have OVERHEAD lighting wherever you may work.
If you will have "closet space" make sure the closet is lit.
More storage space than you think you need.
A "work area" for actual sewing.
A "cutting area" for actual cutting.
A "staging area" for trying out block combinations, like a design board
An "ironing area". In a perfect world, you'd have a dedicated space for each, and not have to play Fabric Jenga to work.
I'd say the storage spaces should have different sizes...like a space for FQ, a space for yardage, a space for tubs. You'd hate to get stuck with 100 cubbies that don't work for you, kwim?
And pics. We want pics. :D