documentclass[10pt]{memoir}                        %document class
setstocksize{240mm}{150mm}

usepackage[T1]{fontenc}                            %font output
usepackage[utf8]{inputenc}                         %font input
usepackage[english]{babel}

usepackage{lipsum}
usepackage{marginfix}
usepackage{graphicx}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% PAGE LAYOUT
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

usepackage{geometry}

letfootruleskipundefined                         %headings
usepackage{fancyhdr}
nouppercaseheads

settrimmedsize{240mm}{150mm}{*}
setlength{trimtop}{0pt}
setlength{trimedge}{stockwidth}
addtolength{trimedge}{-paperwidth}
settypeblocksize{193mm}{84mm}{*}
setulmargins{27mm}{*}{*}
setlrmargins{18mm}{*}{*}
setmarginnotes{3mm}{3.5cm}{onelineskip}
setheadfoot{onelineskip}{onelineskip}
setlength{headsep}{1.2cm}
%setheaderspaces{*}{2onelineskip}{*}
checkandfixthelayout

addtolength{footskip}{0.55cm}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% CAPTION LAYOUT
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

usepackage{caption}                                %customized captions
captionsetup{font=footnotesize, labelfont={bf}}
usepackage{captdef}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% FULLWIDTH
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

usepackage[outermargin=-3.5cm]{fullwidth}

newenvironment{fullwidthblocked}{%
blockmargin%
begin{fullwidth}%
}{%
end{fullwidth}%
unblockmargin%
}

newenvironment{figureDX}[1]{%
begin{fullwidthblocked}%
begin{minipage}{84mm}%
centering%
#1%
end{minipage}%
hspace{1.5mm}%
begin{minipage}{3.5cm}%
}{%
end{minipage}%
end{fullwidthblocked}%
}

begin{figureDX}{includegraphics[scale=•]{•}}
figcaption{•}label{•}
end{figureDX}

newenvironment{figureSX}[1]{%
begin{fullwidthblocked}%
begin{minipage}{3.5cm}%
}{%
end{minipage}%
hspace{1.5mm}%
begin{minipage}{84mm}%
#1%
end{minipage}%
end{fullwidthblocked}%
}