right and no extras...

Pretty realistic. You have enough cap space to put a spare on the roster also.

Regarding the lines you have. I would go with a slightly different approach:

L1: Bertuzzi, Matthews, Marner
L2: Knies, Tavares, Nylander (I don’t think Jarnkrok is a 2nd liner, I wouldn’t put domi on left wing cause Tavares and Nylander are also defensive liabilities like domi; domi needs to be insulated with better defensive players which is why I have him on the left wing on L3 with kampf, jarnkrok)
L3: Domi, Kampf, Jarnkrok (Domi is too defensively unreliable to play centre at this point)(reeves can’t handle third line minutes and will be a liability on L3; I still don’t love kampf as L3 player cause he provides no offence but is very good defensively and hopefully domi and Jarnkrok can add a little offence)
L4: lafferty, holmberg, reeves (this leaves L4 like this which in general has speed from lafferty and toughness from reeves..not sure how good holmberg is)

D: I still think they need to add a bigger shut down d man that can move the puck. No idea how they get that done or make it work.