Here is the source code for the VERY good D&D 5e character sheet by MPMB: https://github.com/morepurplemorebetter/MPMBs-Character-Record-Sheet
Lots of good functions in here to manage a character sheet, import data into an updated sheet, generate spellbooks, log sheet generation, auto-calculate a ton of different things, etc. It would of course need to be adapted, but I think that it could be a large help to people working on a new character sheet for Starfinder!