Sounds like a fun project!
As a landscape architect myself (maybe not so famous, but steward some famous landscapes here) I'd like to know a bit more - like where in southern New England? That's a large swath of territory.
Pictures (worth thousands of words) might also be helpful in recommending more things, but scale is very important as is the view from various directions. Seeing the site without anything yet planted may allow provision of comments to mean a lot more.
I'd also like to know the reason for the specific selection of Japanese Boxwood (Buxus microphylla var. japonica) versus any number of other potential selections. In zone 7a, you certainly should not have any hardiness issues.
Other good information is soil type (sandy, loam, clay) and pH range, as well as likely annual rainfall.
