main.tex

\documentclass[letterpaper,showtrims,openright,onesided,12pt]{memoir}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{pgfornament}
\graphicspath{images/}
\usepackage{subfiles}
\usepackage{blindtext}
\usepackage{ursaline}

% see memoir docs for deets -- https://mirror2.sandyriver.net/pub/ctan/macros/latex/contrib/memoir/memman.pdf
% stock = the size of paper will be printed on
% trimmed = what the paper will be trimmed down to
% To be printed on A5 paper (actually A4 paper, but that's dealt with later, during the print imposition)
\setstocksize{210mm}{148.5mm}
% The actual page size, here with a 4:3 ratio
\settrimmedsize{193mm}{145mm}{*}
% Trim 17 mm from the top and 3.5 mm from the fore-edge after printing:
\settrims{17mm}{3.5mm}

% Uncomment this to preview the book wihtout the trims to see what the final results will look like:
% \setstocksize{193mm}{145mm}
% \settrimmedsize{193mm}{145mm}{*}
% \settrims{0mm}{0mm}

% Left/right margins:
\setlrmarginsandblock{15mm}{25mm}{*}
% Upper/lower margins:
\setulmarginsandblock{15mm}{30mm}{*}
\checkandfixthelayout{}
\OnehalfSpacing{}

\title{Test Template}
\author{Test mcTestFace}
\date{}

\pagestyle{simple}
\chapterstyle{dowding}
\renewcommand\cftchapteraftersnumb{\enspace\textperiodcentered\enspace}
\renewcommand\chapternumberlinebox[2]{#2}
\setsecnumdepth{none}
\begin{document}

\frontmatter

\begin{halftitle}
	\textsc{Test}

\end{halftitle}

\begin{frontispiece}
	\pgfornament[width=1.5cm]{9}
\end{frontispiece}

\begin{titlingpage}
	\aliaspagestyle{titlingpage}{cleared}
	\setlength{\droptitle}{50pt}
	\maketitle{}
\end{titlingpage}

\begin{editionnotice}
  \autorows{c}{2}{c}{
    First Web Edition,16th August 2010,
    2nd Edition, 17th April 2012,
    3rd Edition, 14th April 2021
  }

\end{editionnotice}

\begin{dedication}
	This work was conceived as a birthday tribute to E.H. Smith, whose trilogy \emph{Marks and Scars}, \emph{Without Enchantment}, and \emph{No Great Magic} first crossed the Vorkosiverse with the Potterverse, to stunning effect.
\end{dedication}

\tableofcontents*

\mainmatter{}

\savepagenumber{}
%\openleft{} % chapter title on verso page
\thispagestyle{empty}

%\chapter[A][B]{C}
%Where "A" should be the chapter title in ToC, "B" the chapter title in the header, and C the chapter title in the main text
%\addcontentsline{toc}{chapter}{Chapter One}
%\chapter{Debugger}
%\subfile{contents/var_debug}
\chapter{Chapter One}
\restorepagenumber{}
\vspace*{\droptitle}
\begin{verse}
	\emph{What seas what shores what grey rocks and what islands\\
		What waters lapping the shore\\
		What memories return\\
		Oh my daughter}
\end{verse}
\attrib{TS Eliot}
\clearpage % go to recto page
\blindtext{}
\chapter{Chapter Two}
\blinddocument{}
\addcontentsline{toc}{chapter}{End Notes}
\backmatter{}
\chapter*{End Notes}
\blindtext{}
\end{document}