I'd do Zeller(to match salary), Bradley, Terry Rozier, the Clippers pick, Memphis pick, our 2018 pick for Paul George.
Then try to sign Jamychal Green for about 16-18 million per.
Then let everyone walk and draft Markelle Fultz.
Not a cap expert so don't know if it will work.
That'll leave us with:
Isaiah Thomas - Markelle Fultz
Jaylen Brown - Marcus Smart
Paul George - Jae Crowder
Jamychal Green
Al Horford - Ante Zizic
Not sure how we fill out the rest of the roster based on salary cap rules but would like to bring back Gerald Green, and sign a mid-level guy like Justin Holiday... I like Willie Reed as well but he will probably command around 12 million per. Also, I wouldn't mind bringing Yabusele over to add to our front court. Our backcourt/ wing depth would be insane.
Don't roast me if my roster is not possible

Next summer either let Thomas walk or trade him at the trade deadline.
Then next year draft Deandre Ayton. Be a terrific team in the present and then have a dynasty with Fultz-Brown-Ayton and Stevens.