How to add page numbers and rotated chapter title to the outer margin?

Question

I'd like to have page numbers on the outer page border slightly bellow the center, and the current chapter title at the bottom but rotated 90 degrees counter-clockwise (i.e. to the left) such that it also sticks to the page outer border, i.e.

+--------------+--------------+
|              |              |
|              |              |
|              |              |
|              |              |
|              |              |
|p             |             p|   p = page number
|              |              |
|C             |             C|   CT = chapter title, rotated
|T             |             T|        90 degrees counter-clockwise
+--------------+--------------+

Sure enough I could use tikz-pgf in a similar way as mentioned here (and I'm already using tikz due to that very scenario), via

\node [anchor=west] at ([yshift=-0.5cm] current page.west){\pagemark}

and similarly use it to rotate the chapter title, but isn't there a better way that maybe also respects pagestyle, e.g. by defining a pagemargin similar to pageheader?

Answer 1

Here is a suggestion using package scrlayer-scrpage to define a new page style:

\documentclass[
  %oneside
]{scrbook}
\usepackage[top=30mm,bottom=30mm,inner=25mm,outer=35mm]{geometry} 
\usepackage{blindtext}
\usepackage{rotating}
\usepackage{scrlayer-scrpage}
\automark[chapter]{chapter}

% new font element for the text in outermargin
\newkomafont{outermargin}{\scshape\Large}

% declare new layers for the outermargin
\DeclareNewLayer[
  foreground,
  outermargin,
  oddpage,
  contents={\rotatebox{90}{\parbox[b][\layerwidth][b]{\layerheight}{%
    \hspace*{.5cm}\parbox[b]{.35\layerheight}{\usekomafont{outermargin}\headmark}%
    \vspace*{.5cm}}}}
]{ChapterInOutermargin.odd}
\DeclareNewLayer[
  clone=ChapterInOutermargin.odd,
  evenpage,
  contents={\rotatebox{90}{\parbox[t][\layerwidth][t]{\layerheight}{%
    \vspace*{.5cm}%
    \hspace*{.5cm}\parbox[t]{.35\layerheight}{\usekomafont{outermargin}\headmark}}}}
]{ChapterInOutermargin.even}
\DeclareNewLayer[
  clone=ChapterInOutermargin.odd,
  contents={\parbox{\layerwidth}{\vspace*{.55\layerheight}%
      \hfill\usekomafont{outermargin}\pagemark\hspace*{.5cm}}}
  ]{PagenumberInOutermargin.odd}
\DeclareNewLayer[
  clone=ChapterInOutermargin.even,
  contents={\parbox{\layerwidth}{\vspace*{.55\layerheight}%
      \hspace*{.5cm}\usekomafont{outermargin}\pagemark\hfill}}
  ]{PagenumberInOutermargin.even}

% declare new page styles using the new layers
\DeclarePageStyleByLayers{outermargin}{%
  ChapterInOutermargin.odd,ChapterInOutermargin.even,%
  PagenumberInOutermargin.odd,PagenumberInOutermargin.even}
\DeclarePageStyleByLayers{plain.outermargin}{%
  PagenumberInOutermargin.odd,PagenumberInOutermargin.even}

% if page style plain should be an alias for plain.outermargin
\RedeclarePageStyleAlias{plain}{plain.outermargin}

% use the new page style
\pagestyle{outermargin}
% if chapter pages should use page style outermargin instead plain
\renewcommand*{\chapterpagestyle}{outermargin}

\begin{document}
\tableofcontents
\blinddocument
\end{document}