I like the players you added. I don't think signing other teams RFA's is an option most GMs pursue. You would most likely have to trade for their rights. I also think Beagle is going to cash in a bit, i think someone over pays and gives him 2.5-3 somewhere. i would also re-arrange your lines you have some guys out of position. Sprong plays RW exclusively.

I give you two stars cause I like the players we get back in the Nashville deal and it’s a good layout, but simply not enough that it’d make sense for Nashville to do. Tolvanen is the real deal and Ellis is an absolute bargain. Probably would have to add the 2019 1st too which is just too expensive for the pens blood unless Ellis also signs an extension right away.
Another issue is that Buffalo doesn’t need Sheary, they have tons of wingers that are exactly like Sheary but cheaper. And Sheary is worth probably a 3rd at most.
Pens would have to add a prospect like maybe Ethan Prow (since there is no room for him here) for AZ to take on the Hunwick contract, but since you have a ton of cap space, seems kind of silly to trade him with the pens injury luck.
It’s kind of pointless to sign Brandon Tanev if you re-sign Simon.
Beagle is likely to cash in and becomes an unnecessary signing if you re-sign Sheahan, unless you used Brassard in a trade.
And Sprong is strictly a RW.