The pendant overhead light socket displayed in the first image you e-mailed requires to be clipped to a trim piece such as I bought from Newton Electric Supply Co. 48 Mechanic St. Newton, MA 02464. Phone: (617) 527-2040 for about $9.50 each. After the plastering had been completed I asked Tim LeBlanc to count the number of trim pieces required, and he undercounted, I thought by two, but perhaps by only one unit. To purchase the additional one or two units required, you need to know its identifying number.  

If you search the filing cabinet on the third floor you may or may not find a file folder with Nantucket building documents and in this file folder you may or may not find the invoice from Newton Electric Supply Co. with the file number of the required trim piece(s). All of the more than 40 trim pieces presently installed on Nantucket are identical with each other and with the more than 50 such trim pieces presently installed in the Addition. You are welcome to "borrow" one or two of the trim pieces from Belmont to take to and install on Nantucket.

You may also telephone Newton Electric Supply Co. 617-527-2040 and ask them if they have records of my purchase(s), in the year of the plastering or thereafter, of the trim in issue and if so, ask them to provide you with one or more additional pieces. You may also remove one of the trim pieces in the Addition in order to measure it and to try to find a replacement on the Internet, e.g. https://www.build.com/recessed-lighting-trims/c114024?facets=60134:Baffle%20Trims

The second image is of a recessed octagonal box for possible track lighting.  I installed and wired such boxes, with their associated 2"x4" boxes for "two wire" single pole switches beside the windows below, in each of the four rooms of the second floor. Such track lighting installations are not required by code and you have the option of covering the outlet boxes on the ceiling and the switch boxes on the walls with flat metal or plastic plates prior to any inspection. 

If you decide to install track lighting in one or more rooms, consider that track lighting is not required for the final wiring inspection, and is not subject to inspection if it is installed thereafter. I installed expensive and more elegant "Lightolier" track lighting in my Cambridge office, various expensive fixtures of which are stored on the top shelf in the washing machine room at 174 School Street adjacent to the abandoned chimney. Whether and where the associated track could be found I don't remember. The kitchen track lighting in Konnarock and in Belmont was, if I remember correctly, Home Depot's inhouse "Hampton Bay" brand, whose tracks and fixtures are incompatible with Lightolier. The single pole (two way) wall switch required for each track lighting installation is independent of and the same for "Lightolier" or "Hampton Bay".

Incidentally, I made many trips to Newton Electrical Supply by driving through Watertown Square and up Walnut Street through Newton Center; but most recently found it more convenient albeit much longer to take Route 2 to 128 and then to drive in to Mechanic Street on the Turnpike.  

You must also decide whether or not and in which rooms you want to install ventian blinds for "privacy". Nathaniel and Sabine did not require them.