This shouldn't be too hard to work out in a trade because everybody is basically on a rookie contract.
But offer up Sully, KO, Rozier, RJ, James Young, possibly Jerebko (they worked with him before. Maybe they like him), the Dallas pick and ours next year, a couple 2nd rounders, a 2018 first, Crowder is on a good contract for a while. Maybe we take back a bad contract.
Immediately give Drum a large long contract
Pair Smart, Drum, and Bradley..and maybe Stanley Johnson....dominate defensively for a decade.
I'm gonna try to figure this out with the trade machine.
IMHO that's way too much to give up for Drummond.
Also one of the biggest limitations with this team is lack of outside shooting - not the type of team you want put around a guy like Drummond, who has no game at all (offensive or defensive) outside of 5 feet.
I'd much rather try for Nerlens Noel. He's likely available much cheaper and still has some rookie contact left, so you could afford to get him AND add shooters around him.
Drummond would require nothing less than a max contract to re-sign and I'm not sure he's worth one, at least not yet.