I felt that the previous PowerCMS thread had gotten too long and also outlived its usefulness in the sense that it has resolved the three linked issues of installation, inputting, and accessibility of all parts relative to both SuperAdministrator and any created Users.
Therefore the only things remaining to be untested are:
(1) the successful insertion and display of content areas;
(2) proper behaviour of toolbars.
It seemed appropriate to start a new thread for content and Developer Notes matters.