I don't particularly like this trade idea, although I do love Steven Adams.
I will say, this trade proposal reminds me of my all-time favorite trade idea, from back in 2011/2012 time frame: trade Rondo and some other stuff for Steve Nash and Marcin Gortat.
I really thought Nash and Gortat would've been awesome playing with the Big 3, even though that would've been a super old team.
I don't like the money of this trade idea, and I don't trust CP3 to be anywhere near 100% for a full playoff run, so it's a no from me.
That said, at full health I do think that a lineup of CP3 - Smart - Brown - Tatum - Adams would be really good.