Creando una representación gráfica de una tabla de contenidos en TikZ

Question

Me cuesta crear una representación gráfica del contenido de un libro con TikZ. Se adjunta un ejemplo que he creado en Powerpoint. Estoy especialmente interesado en el posicionamiento relativo y no en la declaración de longitudes/posicionamiento absolutos.

He jugado con el siguiente código:

\documentclass[11pt]{scrartcl}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes,calc}

\begin{document}
\begin{figure}
\begin{tikzpicture}[every node/.style=draw,scale=1.25] 
\tikzset{part/.style={fill=gray!20,minimum width=1em,minimum height=1.4em,align=left}}
\draw[fill=gray,minimum width=10em,minimum height=6em,align=left,anchor=south west]   (0,0) rectangle (8,4) coordinate[pos=.5](O);
\node [above=.5em,part,xshift=1em] (part1) at (O){Part I};
\node[on grid,part,below=2em of part1] (part2){Part II};
\node[on grid,part,below=2em of part2] (part2){Part III};   
\end{tikzpicture}
\end{figure}
\end{document}

Answer 1

Un intento rápido (cambie el texto y la escala según sea necesario cambiando solo \ut):

\documentclass[border=2pt,tikz]{standalone}
\usetikzlibrary{calc,positioning,backgrounds,fit}
\renewcommand{\rmdefault}{ptm}
\begin{document}

\newcommand{\ut}{4mm}
\begin{tikzpicture}[bk/.style args={#1}{draw,fill=gray!20,minimum height=2.7*\ut,minimum width=#1*\ut,align=center}, part/.style={inner sep=0pt,outer sep=0pt,font={\Large\bfseries}, white,align=left, xshift=-8*\ut}, node distance=.5*\ut]

\node[bk=30](c1){Chapter 1\\\textit{Chapter 1 Title}};
\node[bk=9.75,below=of c1.south west, anchor=north west](c2){Chapter 2\\\textit{Chapter 2 Title}};
\node[bk=19.75,below=of c1.south east, anchor=north east](c3){Chapter 3\\\textit{Chapter 3 Title}};

\node[part,left=of {$(c1.west)!.5!(c2.west)$},anchor=west](P1){Part I\\\textit{Part I Title}};

\begin{scope}[on background layer]
\node[rectangle,fill=gray!70,fit=(c1)(c2)(P1),inner sep=10pt] {};
\end{scope}

\node[bk=30,below=of c2.south west,anchor=north west,yshift=-2em](c1){Chapter 4\\\textit{Chapter 4 Title}};
\node[bk=30,below=of c1.south west, anchor=north west](c2){Chapter 5\\\textit{Chapter 5 Title}};
\node[bk=30,below=of c2.south east, anchor=north east](c3){Chapter 6\\\textit{Chapter 6 Title}};

\node[part,left=of {$(c1.west)!.5!(c3.west)$},anchor=west](P2){Part II\\\textit{Part II Title}};

\begin{scope}[shift={(0,-10*\ut)},on background layer]
\node[rectangle,fill=gray!70,fit=(c1)(c3)(P2),inner sep=10pt] {};
\end{scope}

\node[bk=30,below=of c3.south,anchor=north,yshift=-2em](c1){Chapter 7\\\textit{Chapter 7 Title}};
\node[bk=9.75,below=of c1.south west, anchor=north west](c2){Chapter 8\\\textit{Chapter 8 Title}};
\node[bk=9.75,below=of c1.south east, anchor=north east](c3){Chapter 10\\\textit{Chapter 10 Title}};
\node[bk=9.5,left=of c3.west, anchor=east](c4){Chapter 9\\ \textit{Chapter 9 Title}};

\node[part,left=of {$(c1.west)!.5!(c2.west)$},anchor=west](P3){Part III\\\textit{Part III Title}};

\begin{scope}[shift={(0,-24*\ut)},on background layer]
\node[rectangle,fill=gray!70,fit=(c1)(c2)(P3),inner sep=10pt] {};
\end{scope}

\end{tikzpicture}

\end{document}