The package showframe.sty seems not to play nicely with memoir.cls. A minimum example where the displayed main frame box doesn't coincide with the position of the main body text:
\documentclass[a4paper]{memoir}
\textwidth = 12.2cm
\textheight = 19.8cm
\oddsidemargin = 1.95 cm
\evensidemargin = 1.95 cm
\topmargin = 2.1cm
\usepackage{blindtext,showframe}
\begin{document}
\Blindtext
\Blindtext
\end{document}
(Things only get worse with the frames for headers not matching custom-designed headers, etc.)
All I want to be able to do is to show (for editing purposes) the frame surrounding the main body text on a page. Indeed, all I really need is to be able to show the location of the bottom of the main textbox. Any easy way of doing this?


\documentclass{memoir} \usepackage{blindtext,showframe} \begin{document} \Blindtext \end{document}does not show any problems with the interplay betweenmemoirandshowframe. So it is difficult to answer your question as long as it is unclear what the problem is. – gernot Mar 20 '17 at 14:55\usepackage[showframe, pass]{geometry}and see if it achieves your goal – Troy Mar 20 '17 at 15:12:-)– Troy Mar 21 '17 at 09:14