I didn't account for O'Neale, but it's close - ($19.2 million without Favors, Exum and the non-guaranteeds - only keeping O'Neale)
http://www.basketballinsiders.com/maximum-salary-cap-space-projections-for-2018-19/
Like I said before:
Renounce Thabo by July 1 (at $5.25, we should do this regardless)
Renounce Favors (actually, it would be better if he just agrees to sign elsewhere during the moratorium so it looks like we are left with a PF need so this all comes together)
Renounce Jerekbo, Neto, Udoh, Stockton
Re-sign Exum to $5 million
At that point, we have $14.2 million of cap space. Tobias Harris makes $14.8 million. If we traded Bradley and our 2019 1st for Harris, we could actually sign Exum for a little more than $6 million. But we have to sign Exum before we make the deal because Exum's hold is $15 million but his contract would only be $5 or $6 under these circumstances.
PG Rubio, Exum
SG Donovan, Grayson, Burks
SF Ingles, O'Neale
PF Harris, Crowder
C Gobert
The rest of the roster would be filled by minimum type contracts, MLE and BAE. We would need to do a good job finding a couple bigs like Jerekbo and Udoh.
But overall, this whole thinking is unrealistic (whoever asked the question earlier about just renouncing everybody and adding Harris). I don't think the Clippers would give up Harris for so little. If they really look to trade Harris, I think they want to attach a bad contract or get something bigger.