Well, you certainly are going to be a terrifying team. Not going to comment on the fairness of the trade, hard to evaluate. I will however suggest you keep the Sedins together. Maybe swap Malkin and H.Sedin? In any case, Malkin and Kessel don't seem to like each other very much, even if they do produce well. Anyway, this would give the Sedins a sniper, which is as perfect as it gets.

A big concern I see with the team overall is the Pk...its pretty weak as you have it. I would say Rowney would need to be in the lineup over wilson.
I also agree that the sedins work well together and it brings back the 3 power scoring lines with a 4th line that can still do damage.
At this point I kind of doubt VAN ownership would want to retain money on a rebuilding team (even if it is just for a year)
Might I suggest removing the VAN 1st and retained salary, and changing the Pit 1st to Sheary? This would give the team 2 mill in cap space.
Any of Rust Sprong or ZAR could rotate playing right wing with sid and Jake.

While I agree that acquiring the Sedin twins makes us incredible favorites to 3-peat this year, my only concern is salary. I don't think that a rebuilding team like Vancouver will want Hornqvist and Hagelin. Maatta might entice them, as well as the picks. But they will want some younger talent like Sprong, ZAR, Bluegar, Sheary, etc, over older guys who are costly and will be gone before they are competitive again. If you can't unload Hagelin and Hornqvist, then there is no way you can make the $$$ work to fit the Sedins in under the cap. Your proposed lineup is scary as hell though.

Just give VAN guentzal + 1st, that's all you need, Hornqvist and hagelin won't help the team