Wow you have been working so hard, and it really shows!
I hope all your newest plants make it. In my zone 8 climate, which is very wet in fall and winter, I have found planting too late in the fall is not a good idea. The plants are actually likely to die, possibly the roots have not gotten deep enough for when it does freeze, I am not sure. Early fall or even very early spring are better here for planting. Baltimore however is pretty mild, and much less soggy in the winter so probably OK for you.
I like the birdbath idea, seems like a perfect spot for one. What are you going to do with the paths?
