It looks like Google is set to make some back-end changes to how its Custom Search Engines work, to better suit mobile search users…

“The search space is evolving rapidly and we want to make sure that CSE continues to evolve to meet the needs of your users, whether they are visiting from desktop or mobile devices.”

This means a need for a few API changes, from April 2017. Linked CSE’s will have to be done via the CSE Control Panel (I thought they were already, in part) in future, as will Dynamic Link Extraction. None of these API changes affect JURN. Hopefully the Linked CSEs changes may even make it easier for me to set up new search side-projects for JURN.