With exception to Zbikowski, I like most of your picks, C-Mize.
Samardizja would give us a much needed weapon at receiver. He has a great pair of hands, seems to be able to stretch the field, and has great height, which will help us a lot in the red zone.
Irons and Leonard both address depth in the backfield, which is a must since Henderson and Green are near the end.
I don't like Zbikowski much at the next level. I watch a fair bit of Notre Dame games, and he's one of my fav players on that team, but I don't think he covers well enough to be anything but a liability at the next level. He probably falls to the second day and carves out a future as a good special teamer.
Don't know much about Scott, since I haven't seen much of GT, but depth in the secondary doesn't hurt. Ideally, when Woodson and Harris get older we can have two youngsters step in and play at the high level like when Sheppard and Brown came in and started at corner for Philly a few years ago.
I'd prefer the team to address TE earlier in the draft, but Harris isn't a bad pick if you can grab him this late. Should be able to help in the red zone, and that's one of the key weak points on this team.