I'm not sure that under this proposal we have much left to figure things out with. Obviously it all depends on the "filler" pieces, but it doesn't sound as if the proposal suggests these will be useful pieces. Next year, our team would be:
Fox
Haliburton/James/Ramsey
DQJ/Woodard
--
Towns
We would have no first round pick this year, or two years down the road, and we would be paying at least $73M (again, unless filler made it worse) for a lineup featuring three proven NBA rotation players and a grand total of one player over 6'8". We would have about $39M in cap space to hunt out literally 5 rotation players to fill out the lineup. Keep in mind that Sacramento is notoriously NOT a free agent destination.
This proposal is laying the entire cupboard bare on the hopes that it can build a team out of free agency in a market that needs to build through the draft. I can see Bagley + one of Barnes/Buddy for Towns, but all three AND two draft picks looks like it would guarantee us in the lottery for three more years and only one pick to show for it.