Well, the only problem with THAT list is it makes me want to plant MORE seeds! Lol i'm a newbie so i can't spot any flaws in your master plan but i didn't think we could start marigolds yet (that presumption is based on NOTHING) so if nobody chimes in and puts the kee-bosh on those then i'm gonna plant some now also.

I'd wait on zinnia, petunia, marigold, and sunflower if it was me.

I would definitely not start Zinnia, sunflower, or marigold yet. In fact, I am direct sowing those seeds. Marigold's tranplant okay, but unless you are only growing a dozen or so, its going to be a lot of transplanting. They are super easy to DS.

a few other flowers I am wondering about

alyssum
calendula
nasturium
bee balm
lupine
Cleome
pansy
dianthus
four o clock

And After this I am all done no more choices lol

cosmos, morning glory should also wait. Why? You can winter sow seeds at any time. There are some annuals, however; that not only sprout easily, but perhaps will not survive a subsequent freeze snap. In other words, you can have a brief period of warmth, and these guys, plus the ones listed above will germinate like crazy. The secret is knowing your own garden and your climate. I think we have all lost a few to freaky weather, but I know what my containers can handle.

Also remember that the temp inside your jugs is warmer than the outside...not a lot, say 15 degrees, but that might be enough to stimulate the tender annuals.

Hardy annuals - no problem. They can take cold temps. It's really amazing to see that happen.