Spezielle Form der Kapitelüberschrift

\documentclass{scrbook}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[ngerman]{babel}
\setkomafont{chapter}{\huge}
\makeatletter
% Hack: Eigenen, rudimentären Kapitelstil definieren.
\newcommand*{\scr@dsc@def@style@xchapter@command}[1]{%
  \scr@dsc@def@style@chapter@command{#1}%
  \expandafter\def\csname @@make#1head\endcsname##1{%
    \let\orig@raggedchapter\raggedchapter
    \let\raggedchapter\raggedleft
    \let\orig@hangfrom\@hangfrom
    \let\@hangfrom\chapterhang
    \scr@@makechapterhead{#1}{##1}%
    \let\@hangfrom\orig@saved@hangfrom
    \let\raggedchapter\orig@raggedchapter
  }%
}
\makeatother
\DeclareSectionCommand[style=xchapter]{chapter}
\newbox\chapternumberbox
\newcommand{\chapterhang}[2]{%
  \savebox\chapternumberbox{\fontsize{100}{100}\normalfont\sffamily\bfseries
    \thechapter}%
  \parbox[t]{\dimexpr\linewidth-\wd\chapternumberbox-1em}{%
    \raggedleft
    \makebox[1em][l]{\normalfont\normalsize\slshape\chapapp}\\
    #2%
  }\quad
  \raisebox{-1.75\baselineskip}{\usebox\chapternumberbox}\par
}   
\usepackage{mwe}
\begin{document}
\tableofcontents
\setcounter{chapter}{3}
\chapter{Erarbeitete technische Prinzipien}
\Blindtext
 
\end{document}