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\documentclass[a4paper, 12pt]{scrreprt}
%\usepackage{showframe}
\usepackage{comment}
\usepackage{tikz}
\usepackage{tabularx}
\usepackage{scrlayer-scrpage}
\usepackage[%
top=2.5cm,%
bottom=1.2cm,%
left=2.0cm,%
right=1cm, % 
includehead, 
includefoot]{geometry}
\addtokomafont{pagehead}{\sffamily}
\addtokomafont{pagefoot}{\sffamily}

\KOMAoptions{headwidth=\textwidth+6mm:-3mm}
\KOMAoptions{footwidth=\textwidth+6mm:-3mm}
\setlength{\headsep}{3mm}
\renewcommand{\chapterpagestyle}{scrheadings}
\renewcommand{\headfont}{\normalfont\sffamily}

%---------------------------------------------------
\newcommand\fsep{3mm}
\newcommand\fpAh{1in+\hoffset+\oddsidemargin-\fsep}

\newcommand\fpBv{\paperheight-1in-\voffset-\topmargin}
\newcommand\fpBh{1in+\hoffset+\oddsidemargin+\fsep+\textwidth}
\newcommand\fpAv{\footskip-\the\footheight-0.4mm}

\DeclareNewLayer[%
  background,% Hintergrundebene
  page,
  contents={%
    \begin{tikzpicture}%
    \useasboundingbox (0,0) rectangle (\paperwidth, \paperheight);
    \draw (\fpAh,\fpAv ) rectangle (\fpBh,\fpBv);
    \end{tikzpicture}    
    }%
 ]{frameTEST}
\AddLayersToPageStyle{scrheadings}{frameTEST}



\newlength{\headw}
\setlength{\headw}{\textwidth}
\addtolength{\headw}{6mm}

\chead{%
\begin{tabularx}{\the\headw}{%
@{\hspace{3mm}}%
p{0.3\textwidth}%
|p{0.3\textwidth}%
|X%
@{\hspace{3mm}}%
}
\hline
adsf&srtas&srtas\\  \hline
adsf&srtas&srtas\\  \hline
adsf&srtas&srtas \\ \hline
\end{tabularx}
}

\cfoot{%
\begin{tabularx}{\the\headw}{%
@{\hspace{3mm}}%
p{0.15\textwidth}%
|p{0.6\textwidth}%
|X%
@{\hspace{3mm}}%
}
\hline
\textbf{Bauteil}&srtas&Seite: \thepage\\  \hline
\textbf{Kapitel}&srtas& \\  
\end{tabularx}
}


\begin{document}
\chapter{test}
adsfasdf

\end{document}

\documentclass[DIV=14]{scrreprt}
\usepackage[]{showframe}
\usepackage{tikz}

\setlength{\headheight}{10mm}
\setlength{\footheight}{8mm}

\newcommand\fsep{2mm}
\newcommand\fpAh{1in+\hoffset+\oddsidemargin-3mm}
\newcommand\fpAv{10mm}
\newcommand\fpBv{\paperheight-1in-\voffset-\topmargin}
\newcommand\fpBh{1in+\hoffset+\oddsidemargin+3mm+\textwidth}

\usepackage{scrlayer-scrpage}
\DeclareNewLayer[%
  background,% Hintergrundebene
  page,
  contents={%
    \begin{tikzpicture}%
    \useasboundingbox (current page.south west) rectangle (current page.north east);
    \draw[line width=1pt,orange] (\fpAh,\fpAv ) rectangle (\fpBh,\fpBv);
    \draw[line width=1pt,orange] (\fpAh,\fpAv+10mm) -- (\fpBh, \fpAv+10mm);
    \end{tikzpicture}    
    }%
 ]{frameTEST}


\AddLayersToPageStyle{scrheadings}{frameTEST}% nur beim Seitenstil empty


\usepackage{mwe}% Nur zur Demozwecken
\cfoot{test}
\chead{%
\centering
\begin{tabular*}{\textwidth}{@{\hspace{3mm}}p{0.3\textwidth}p{0.3\textwidth}p{0.4\textwidth}}
asdfsadf&afadsf&adfad \\ \hline
asdfsadf&afadsf&adfad \\ \hline
asdfsadf&afadsf&adfad \\
\end{tabular*}
}

\begin{document}
\pagestyle{scrheadings}


\Blindtext[10]
\end{document}