I've already done a post on this that you may be interested in seeing:
https://uselectionatlas.org/FORUM/index.php?topic=206613.msg4469065#msg4469065But, I keep changing my selections, and I've already changed over half the positions since my last post there and I'll probably keep changing it until she is elected.
As I said in that post, I know very little about non elected politicians so, I don't know anything to speculate on the Chief of Staff. That said, my mix now is 9 elected politicians in the Cabinet and 6 who have never held prior elected office (though for a couple of them it wasn't for lack of trying and the final mix is usually around 8/7 either way, so I'm probably not all that far off.
My latest prediction:
1.Treasury, Deval Patrick
2.Commerce, Jill Docking
3.Labor, Jennifer Granholm
4.Interior, Chistine Gregoire
5.Agriculture, Brad Henry
6.Energy, Brian Sandoval
7.Transportation, Michael Coleman
8.Housing and Urban Development, Joacquin Castro
9.Education, Judy Chu
10.Health and Human Services, Michelle Nunn
11.Veterans Affairs, Robert McDonald
12.Defense, Ashton Carter
13.State, Wesley Clark (or Joe Biden)
14.Homeland Security, Ed Rendell
15.Attorney General, Loretta Lynch
Obviously whether Lynch, Carter and McDonald remain in their posts (assuming they want to) will depend on how they do between now and the election.
This is balanced as much as possible regionally, ethnically and by gender and religion. It also puts people in positions where they have relevant past experience, and, as is seeming to become expected, includes a couple Republicans. It's also balanced by age, though it does lean a little to the senior citizen side.
Vice President: Mark Warner or Tim Kaine (most likely Kaine)
Also, my current generic Republican cabinet predictions
1.Treasury, Mitt Romney (or Paul Ryan)
2.Commerce, Haley Barbour (or Ed Gillespie or Reince Priebus)
3.Labor, Mary Fallin
4.Interior, Jan Brewer
5.Agriculture, Sonny Perdue (The former Georgia Governor, not David Perdue, the current Georgia Senator)
6.Energy, Linda Lingle
7.Transportation, Eric Cantor
8.Housing and Urban Development, Greg Ballard
9.Education, Paul Vallas
10.Health and Human Services, Ben Carson (assuming he doesn't become President himself)
11.Veterans Affairs, Bob McDonald
12.Defense, Marco Rubio (assuming he doesn't become President himself)
13.State, John Bolton (or Bob Corker)
14.Homeland Security, Olympia Snowe
15.Attorney General, Orrin Hatch