Rockets receive: Brown, Turner, (+ Hauser)
Bucks receive: Sengun, Reed, DFS, 1-2 Celtics picks
Celtics receive: Giannis, Smith
I don't believe that trade even works. BOS would have to send Hauser to HOU to keep BOS under the 1st apron and allow them to take back Smith using the TPE. It still ends up adding about $14M to BOS cap, eating up a lot of BOS tax room. Turner makes even more than Smith so if you swap those two, BOS would be flirting with the 1st apron.
I don't mind getting Giannis and Smith for Brown and Hauser and a couple of picks. Add 1 pick to Brown to equal Giannis and then one to Hauser to equal Smith. Maybe HOU sends a pick to MIL and this works. But I don't see BOS taking on that much salary.