Sstrhsrtj

I am trying to recreate this diagram from a paper for my thesis. The idea would be that I can scale it to different sizes, only use parts of it and insert different nodes like the circles and triangles.

I have tried reproducing it, but I am quite unexperienced with tikz, so after hours of desperatly trying to make it work I have come up with a huge, unelegant solution, that doesn't really look the way I want it to.

PassOptionsToPackage{svgnames}{xcolor}

documentclass[12pt,a4paper]{scrartcl}

usepackage{tikz, pgf}

usepackage{xltxtra}

renewcommand{familydefault}{sfdefault}

usepackage[T1]{fontenc}

usetikzlibrary{

positioning,

shapes.geometric,

shapes.misc,

calc,

fit,

matrix}



begin{document}

begin{tikzpicture} [pics/myHexagon/.style args={#1/#2/#3}%

{

    code=

    {

     pgfmathsetmacro{mySqrt}{sqrt(3)/2}

    defr{#1}

    defa{#2}

    defc{#3}

    draw [cm={r,0,.5*r,mySqrt*r,(0,0)},fill=c,text=white] 

    (1+a,0) coordinate (-corner 0) coordinate (-corner 6) 

    -- (a,1) coordinate (-corner 1)

    -- (-1-a,1) coordinate (-corner 2)

    -- (-1-a,0) coordinate (-corner 3)

    -- (-a,-1)  coordinate (-corner 4)

    -- (1+a,-1) coordinate (-corner 5)

    -- cycle;

    {asfd}

}

}]



    draw   (0,0)   pic {myHexagon={.6/.3/RoyalBlue}};

    draw  (2,0)    pic {myHexagon={.6/.3/DarkMagenta}};

    draw  (4,0)    pic {myHexagon={.6/.3/RoyalBlue}};

    draw  (6,0)    pic {myHexagon={.6/.3/DarkMagenta}};





    draw  (2,-1.5) node [shape=ellipse,draw,minimum height=1cm,fill=red] {L-Ala};

    draw  (1,-3)   node [shape=ellipse,draw,minimum height=1cm, fill=yellow] {D-Glu};

    draw  (0,-4.5) node [shape=ellipse,draw,minimum height=1cm] {L-Lys};

    draw  (0,-6)   node [shape=ellipse,draw,minimum height=1cm] {D-Ala};



    draw  (1.7,-4.5)   node [shape=circle,draw,minimum height=.75cm] {Gly};

    draw  (3,-4.5) node [shape=circle,draw,minimum height=.75cm] {Gly};

    draw  (4.3,-4.5)   node [shape=circle,draw,minimum height=.75cm] {Gly};

    draw  (5.6,-4.5)   node [shape=circle,draw,minimum height=.75cm] {Gly};

    draw  (6.9,-4.5)   node [shape=circle,draw,minimum height=.75cm] {Gly};



    draw  (8.5,-4.5)   node [shape=ellipse,draw,minimum height=1cm] {D-Ala};

    draw  (7.5,-6) node [shape=ellipse,draw,minimum height=1cm] {L-Lys};

    draw  (6.5,-7.5)   node [shape=ellipse,draw,minimum height=1cm] {D-Glu};

    draw  (5.5,-9) node [shape=ellipse,draw,minimum height=1cm] {L-Ala};



    draw   (3.5,-10.5) pic {myHexagon={.6/.3/RoyalBlue}};

    draw  (1.5,-10.5)  pic {myHexagon={.6/.3/DarkMagenta}};

    draw  (7.5,-10.5)  pic {myHexagon={.6/.3/RoyalBlue}};

    draw  (5.5,-10.5)  pic {myHexagon={.6/.3/DarkMagenta}};

end{tikzpicture}







end{document}

Could someone please help me simplify and complete it?
Thanks!