[Harry Lime]

Gaudreau - Monahan - Foo
Mangiapane - Backlund - Kessel
Tkachuk - Jankowski - Bennett
Klimchuk - Shore - Lazar

Giordano - Hamilton
Kylington - Hamonic
Kulak - Andersson
Hamhuis

Ok, here we go.
Offence
Foo on the top line to start. He's a more talented offensive force than Ferland and isn't afraid of the dirty areas of the ice. Mangiapane on the Backlund line. Guys a scorer, let him play. Trade for Kessel. The big fish, and is within reach. Make Backlunds line an offensive one, albeit with an elite defensive centre. Backlund proved that he can play an offensive game at the Worlds. Third line makes or breaks the season. So much talent there. Klimchuk is the ultimate fourth line guy. No brainer for me.
Defense
See what we have in the best D prospects on the team. Kulak isn't a raw rookie anymore, and Andersson is pretty polished for a new guy. Sheltered minutes they might actually surprise other teams. Kylington is potentially a Brodie clone with better skating. Go to town. Pick up a 'mentor, but can still play' vet in someone like Hamhuis. He's 36, and would be an awesome support player.

I'm done with the 'only defensive line' as the second line.
Combinations of Ferland, Frolik, Stone and Brodie to make the Kessel trade work (based on the rumored ask). All have value.