here is a 2 column layout for a custom detailed images mod.
you will have to make some tweaks, but you get the idea.
Code:
{if $images ne ""}
<table width="100%" cellspacing="1">
<tr><td align="center" colspan="2">
Detailed Images
Click to Enlarge
</td>
</tr>
{assign var="image_counter" value=0}
{section name=image loop=$images}
{if $image_counter is div by 2}
<tr>
{assign var="image_counter" value=0}
{/if}
{math equation="x+1" x=$image_counter assign="image_counter" }
{if $images[image].avail eq "Y"}
<td>
[img]{$images[image].d_url}[/img]
</td>
{capture name=image_index}
{math equation="index+x+1" index=$image_counter x=2}
{/capture}
{if $image_counter is div by 2 }
</tr>
{/if}
{/if}
{/section}
</table>
{/if}
you can see it in action here.
http://ridersinc.com/store/customer/product.php?productid=4357&cat=1083&page=1
the detailed images section below the price and large thumb.