trouble with box model - css

Question

I can't figure out how to set up the box model for my layout.
The "[container|x]" elements you see are placeholders, which are later replaced by php.
Here is a sketch of how it should look like:
I tried to google it and search here on stack overflow and of course I did find a lot about box models and problems with it, but nothing helped me here.
This is what I already have:
html:
<div class='headerimage'>
[container|1]
</div>
<div class='mainwrapper'>
<div class='femininHead'>
[container|2]
</div>
<div class='lineH1'> </div>
<div class='feminin'>
<div class='femininSub1'>
[container|3]
</div>
<div class='lineV1'> </div>
<div class='femininSub2'>
[container|4]
</div>
<div class='lineV2'> </div>
<div class='femininSub3'>
[container|5]
</div>
</div>
<div style='clear:both;'></div>
<div class='maskulinHead'>
[container|6]
</div>
<div class='lineH2'> </div>
<div='maskulin'>
<div class='maskulinSub1'>
[container|7]
</div>
<div class='lineV3'> </div>
<div class='shopButton'>
[container|8]
</div>
</div>
<div style='clear:both;'></div>
<div class='unisexHead'>
[container|9]
</div>
<div class='lineH3'> </div>
<div class='unisex'>
<div class='unisexSub1'>
[container|10]
</div>
<div class='lineV4'> </div>
<div class='unisexSub2'>
[container|11]
</div>
<div class='lineV5'> </div>
<div class='unisexSub3'>
[container|12]
</div>
</div>
</div>
css:
.headerimage {
position:absolute;
left:0px;right:0px;
background-color:#000000;
height:367px;
}
.mainwrapper{
position:relative;
top:367px;
}
.femininHead {
position:relative;
width:800px;
height:87px;
top:50px;
}
.femininHead .image1_headline{
line-height:30px;
font-size:24px;
position:relative;
}
.feminin {
position:relative;
}
.lineH1{
background-image:url(/img/tempdyn/streifenlinie_horizontal.png);
width:800px;
height:1px;
background-color:#000000;
position:relative;
bottom:2px;
}
.femininSub1 {
position:relative;
width:266px;
height:125px;
float:left;
}
.lineV1{
background-image:url(/img/tempdyn/streifenlinie_vertikal.png);
background-repeat:repeat-y;
background-position:right top;
float:left;
height:128px;
width:1px;
background-color:#000000;
position:relative;
}
.femininSub2 {
position:relative;
width:266px;
height:125px;
float:left;
}
.lineV2{
background-image:url(/img/tempdyn/streifenlinie_vertikal.png);
background-repeat:repeat-y;
background-position:right top;
float:left;
height:128px;
width:1px;
background-color:#000000;
position:relative;
}
.femininSub3{
width:266px;
height:125px;
position:relative;
float:left;
position:relative;
}
.maskulinHead {
position:relative;
width:800px;
height:87px;
top:127px;
}
.maskulinHead .image2_headline{
line-height:36px;
font-size:36px;
right:300px;
}
.lineH2{
background-image:url(/img/tempdyn/streifenlinie_horizontal.png);
width:800px;
height:1px;
background-color:#000000;
position:relative;
top:133px;
}
.maskulin {
position:relative;
}
.maskulinSub1 {
position:relative;
width:266px;
height:125px;
float:left;
position:relative;
}
.lineV3{
background-image:url(/img/tempdyn/streifenlinie_vertikal.png);
background-repeat:repeat-y;
background-position:right top;
float:left;
position:relative;
height:128px;
width:1px;
}
.shopButton {
width:536px;
height:218px;
float:left;
position:relative;
}
.unisexHead{
width:259px;
height:125px;
position:relative;
line-height:36px;
font-size:36px;
}
.unisexHead .image3_headline{
line-height:36px;
font-size:36px;
}
.lineH3{
background-image:url(/img/tempdyn/streifenlinie_horizontal.png);
width:800px;
height:1px;
background-color:#000000;
position:relative;
top:594px;
}
.unisex {
position:relative;
}
.unisexSub1
position:relative;
width:266px;
height:125px;
float:left;
}
.lineV4{
background-image:url(/img/tempdyn/streifenlinie_vertikal.png);
background-repeat:repeat-y;
background-position:right top;
float:left;
background-color:#000000;
position:relative;
height:128px;
width:1px;
}
.unisexSub2 {
position:relative;
width:266px;
height:125px;
float:left;
}
.lineV5{
background-image:url(/img/tempdyn/streifenlinie_vertikal.png);
background-repeat:repeat-y;
background-position:right top;
float:left;
background-color:#000000;
position:relative;
height:128px;
width:1px;
}
.unisexSub3{
width:266px;
height:125px;
position:relative;
float:left;
}
Thanks in advance :)

Answer 1

can't see why box-model can help you with this. maybe you are looking for FlexBox! Or go classic and use display:inline-block for the nested boxes(3,4,5,7,8,10,11,12) and all others just row divs.
But don't use floats any more!

Answer 2

Check out this simplified solution on JSBin.
The basic idea is to wrap all the items except the 1st box in a containing wrapper .wrap. A horizontal margin of auto along with a fixed width will center it in the page. Within that, you have your side-by-side boxes float left and give them fixed widths. The div below them needs to clear the float.
Hope the example is helpful.