Below is some follow-up for all who replied, and thank you!
My apology for the delayed response; my wife and I helped my daughter move into the newly-constructed home and have been busy with move-in activities, complicated by the Covid-19 situation.
Pictures of the (almost) completed structure panel wiring:
[Above] The orange tubes are conduits to the outside cable/fiber connection, the attic and the crawl space beneath the house. Synology RT2600 router is mounted above the structure box. Inside the box are a 12-port Cable Matters patch panel, 8-port Netgear switch and modem for the gigabit fiber connection from CenturyLink.
[Above] On the left is the 12-port Cable Matters patch panel. A bundle of 4 Cat 6 ethernet cables enters the back of the patch panel from above, another 4 cables from below. Unused coax cables are tucked away at the top of the structure box.
I removed the poorly-installed RJ45 terminals and connected all of the ethernet cables in the patch panel. The fiber optic cable was installed through the conduit from outside the house, connected to the modem pictured. Synology RT2600AC router is mounted on the wall above the structure box. A second wi-fi access point (Eero version 1, left over from a previous home, now set up in bridge mode) was placed downstairs, connected by cat6 ethernet. Wi-fi coverage throughout the house is excellent.
@MacExpert, @Mpacker, @ACautionaryTale, @evanfuchs - thank you for the patch panel suggestion. The Cable Matters 12-port patch panel is excellent.
@occam, @csf111, @OogieM - The ethernet cables were tested with a Southwire Cable Mapper; all tested OK.
@SpivR, @MacExpert - I would love to have a Pockethernet tester and will consider buying one. For this project there was not enough time to buy from the European source.
@Cbales - Yes, we declined to purchase more services (security system, home automation, distributed audio, etc.) from the builder’s home wiring partner firm. I think we made the right choice to install the basic package of ethernet cabling in various locations, the structure box and the conduits. Coax cables were also installed as part of this basic package, but these will be unused as my daughter has elected to use streaming services (Hulu, Youtube TV) rather than traditional cable company content.
This installation was timely. The internet service provider (Centurylink in the Raleigh NC area) installed the gigabit fiber connection only a few days before my daughter was required to work from home due to the CV-19 restrictions. She now has a good internet connection and reliable home network perfect for her needs.
Thanks again for all who replied. I learned a great deal from this project.