Change footer classicthesis which loads scrlayer-scrpage

Question

I am using the classicthesis style which loads scrlayer-scrpage. I like most parts about this style but want to change a few things. One thing I used to do in other documents is to place a colored box next to the page number in the footer. I normally did it like this:

  \documentclass[a4paper,11pt,fleqn]{book}
\usepackage{color}
\usepackage{fontspec}

\setlength{\textwidth}{146.8mm} % = 210mm - 37mm - 26.2mm
\setlength{\oddsidemargin}{11.6mm} % 37mm - 1in (from hoffset)
\setlength{\evensidemargin}{0.8mm} % = 26.2mm - 1in (from hoffset)
\setlength{\topmargin}{-2.2mm} % = 0mm -1in + 23.2mm 
\setlength{\textheight}{221.9mm} % = 297mm -29.5mm -31.6mm - 14mm (12 to accomodate footline with pagenumber) 
\setlength{\headheight}{14pt}

\usepackage{fancyhdr}
\fancyhf{}
\renewcommand{\footrulewidth}{0pt}
\fancyfoot[EL]{\makebox[0pt][r]{\color{Black}\rule[0pt]{0.55\marginparwidth}    {6pt}\makebox[0.16\marginparwidth][r]{\bfseries\sffamily\color{black}\fontspec[]    {MetaBoldLF-Roman}\thepage}}}%
\fancyfoot[OR]{\makebox[0pt][l]{\makebox[0.16\marginparwidth][1]{\bfseries\sffamily\color{black}\fontspec[]{MetaBoldLF-Roman}\thepage}\color{Blac}\rule[0pt]{0.55\marginparwidth}{6pt}}}%
\fancypagestyle{plain}{
    \fancyhf{}
    \renewcommand{\headrulewidth}{0pt}
    \renewcommand{\footrulewidth}{0pt}
    \fancyfoot[EL]{\makebox[0pt][r]{\color{black}\rule[0pt]    {0.55\marginparwidth}{6pt}\makebox[0.16\marginparwidth][r]    {\bfseries\sffamily\color{black}\fontspec[]{MetaBoldLF-Roman}\thepage}}}%
    \fancyfoot[OR]{\makebox[0pt][l]{\makebox[0.16\marginparwidth][l]    {\bfseries\sffamily\color{black}\fontspec[]{MetaBoldLF-Roman}\thepage}\color{black}\rule[0pt]{0.55\marginparwidth}{6pt}}}}%
\fancypagestyle{addpagenumbersforpdfimports}{
    \fancyhead{}
    \renewcommand{\headrulewidth}{0pt}
    \fancyfoot{}
    \fancyfoot[EL]{\makebox[0pt][r]{\color{black}\rule[0pt]   {0.55\marginparwidth}{6pt}\makebox[0.16\marginparwidth][r] {\bfseries\sffamily\color{black}\fontspec[]{MetaBoldLF-Roman}\thepage}}}%
    \fancyfoot[OR]{\makebox[0pt][l]{\makebox[0.16\marginparwidth][l]    {\bfseries\sffamily\color{black}\fontspec[]{MetaBoldLF-Roman}\thepage}\color{black}\rule[0pt]{0.55\marginparwidth}{6pt}}}}%


\begin{document}
    \chapter{hello Word}
    Hello world
    \chapter{hello Word2}
    Hello world 2
\end{document}  

Can somebody help me translate this to the classicthesis file? Also want it to appear on the chapter starting pages.

Answer 1

If I understand the question, your example does currently not really show, what you want, because it does not show the page number in the page foot on even pages or chapter pages. So I cannot decide whether or not the following is really what you expect:

\documentclass[a4paper,11pt,fleqn]{book}
\usepackage{color}
\usepackage{fontspec}

\setlength{\textwidth}{146.8mm} % = 210mm - 37mm - 26.2mm
\setlength{\oddsidemargin}{11.6mm} % 37mm - 1in (from hoffset)
\setlength{\evensidemargin}{0.8mm} % = 26.2mm - 1in (from hoffset)
\setlength{\topmargin}{-2.2mm} % = 0mm -1in + 23.2mm 
\setlength{\textheight}{221.9mm} % = 297mm -29.5mm -31.6mm - 14mm (12 to accomodate footline with pagenumber) 
\setlength{\headheight}{14pt}
% Put \marginparwidth onto the page
\setlength{\marginparwidth}{\dimexpr\paperwidth-\oddsidemargin-1in-\textwidth-\marginparsep}

\usepackage[footwidth=textwithmarginpar]{scrlayer-scrpage}
\clearpairofpagestyles
\ihead{\headmark}
\rofoot*{%
  \makebox[\dimexpr\marginparsep+\marginparwidth\relax]{%
    \pagemark\hfill\rule{.55\marginparwidth}{6pt}%
  }%
}
\lefoot*{%
  \makebox[\dimexpr\marginparsep+\marginparwidth\relax]{%
    \rule{.55\marginparwidth}{6pt}\hfill\pagemark
  }%
}

\usepackage{mwe}

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

If you want to change the font at the page footer, just use something like

\setkomafont{pagefoot}{\bfseries}% You can also use \fontspec here.

If you want to change the color of the rule, e.g. red color, use either

\textcolor{red}{\rule{.55\marginparwidth}{6pt}}

or

\addtokomafont{pagefoot}{\color{red}}
\addtokomafont{pagenumber}{\normalcolor}