We're talking about fit right now in part because we balked at Porzingis because he didn't want to work out for us. I'm not making that mistake again. Don't overthink anything, you pick Simmons and then start thinking about which guards are available at 24/26 where you're likely looking at a group of options that includes Patrick McCaw, Caris LeVert, Cat Barber, Malcolm Brogdon and hopefully one of Malik Beasley / Malachi Richardson / Dejounte Murray. Pick the best one you can find and go international (Guerschon Yabusele, Ante Zizic, Zhou Qi, Juan Hernangomez, Petr Cornelie, Rade Zagorac, Isaia Cordinier) with the other (or trade it for a future first).
Throw money at Bradley Beal, Allen Crabbe, Fournier, Bazemore, Clarkson, Courtney Lee, maybe Batum and hope you get one of them to play shooting guard but figure we miss on the top guys.
Point guard is harder. Ish doesn't fit with Simmons, you need a shooter. Clarkson could fit here too I guess, or people like Matthew Dellavedova (interestingly, another Australian. This might not be the worst idea). I would go hard after Seth Curry to back him up as well.
Let's assume we're still a year away from attracting big free agents. So don't swing for the fences, look to sign guys who fit what we want to do and hit doubles with this signings.
So let's say we can sign Courtney Lee (39% from 3), Curry (45% from 3) and Delly (41% from 3). All are good 3-point shooters and excellent defenders who don't need the ball. We would go into next season with:
PG: Matthew Dellavedova / Seth Curry / TJ McConnell / Kendell Marshall
SG: Courtney Lee / Nik Stauskas / Guard picked at 24 or 26
SF: Ben Simmons / Robert Covington / Hollis Thompson
PF: Jahlil Okafor / Dario Saric / Jeremi Grant / Carl Landry
C: Nerlens Noel / Joel Embiid / Richan Holmes
Obviously, that's 17 guys, so someone people (Marshall is one) would have to be cut/traded, but that looks like a real NBA basketball team.
Once Embiid proves to be healthy, we can start to look for deals for Noel.
The team would also have our own first rounder, LA's first rounder and the Kings swap option in a strong 2017 draft.
Plus around 42-45M to spend in free agency next off-season.