I've been playing with these numbers for a while, so figured I'd share what I'm using in hopes it's helpful, and so others might catch mistakes I'm making.
A few notes: you can see by the middle column how tight it is to sign Hayward while saving AB+Crowder+Smart for a later PG deal. It only works if (1) you stash Yabu, (2) you renounce everyone you can, and (3) you can convince Tatum to sign for 5% over slot (rookies are allowed to sign for up to 20% over cap). There's no wiggle room here at all if you want to keep the full max as an option ($1100 under cap!).
Once you've done that, there's an option I hadn't really considered that makes the PG deal much easier-- you can give AB (or Smart, or maybe Crowder, though he has multiple years left) a raise! If the idea is to trade for PG, you want IND to first renegotiate his deal much higher so that you can then extend him to a max contract. Since extensions can only have a 7.5% raise, you want him at least at 27.6m this year. That's tough since outgoing salaries have to be within (I believe) 5mil of what's coming back. But, I think, you can just give each of those guys a little extra cash this season to make it work. Of course, then IND is paying more for them, which they have to agree to, which probably means they ask for a better draft pick return, which in turn might be why we're talking about something like the LAL/SAC and/or MEM picks being included.
So, am I forgetting anything that we know about, or ignoring any relevant rules?