There was a recent article in Stereophile from Kongens Lyngby of Denmark where ceiling height wasn't the biggest concern regarding room modes. That being said, I would focus on wall, floor and ceiling construction as being as stout as possible including double walls of sheetrock and sealing all cracks and voids. Electrical should be pretty straightforward with dedicated electrical runs. I helped my brother build his recording studio and it sounds very good with double wall construction and concrete floors with a floating wood floor above.
https://www.gossardstudios.com/
https://www.gossardstudios.com/