[KingsGambit]

Almost normal postbit (trimmed ):

<table cellpadding="{tableouterborderwidth}" cellspacing="0" border="0" bgcolor="{tablebordercolor}" {tableouterextra} width="{contenttablewidth}" align="center"><tr><td>
<table cellpadding="4" cellspacing="{tableinnerborderwidth}" border="0" {tableinnerextra} width="100%">
<tr>
<td bgcolor="$post[backcolor]" width="175" valign="top" nowrap>

This is what goes on the left (username/avatar/member info/etc

</td></tr>
</table>

<td bgcolor="$post[backcolor]" width="100%" height="100%" valign="top">
<table width="100%" border="0" cellpadding="0" align="left" height="100%">

This is what goes on the right (message icon/subject/message/signature/etc.

</td></tr>
</table>

</table><br>
<!-- spacer --></td><td width="10"><img width="10" height="1" src="{imagesfolder}/space.gif" alt="">
</td></tr></table>

To not have any sperator, just make it so it's one big table, instead of two, one smaller and one larger, then manipulate the images within that, I would imagine. The images at top and bottom are another table again.
I know this might sound a little dumb, but if you have a WYSIWYG HTML editor like frontpage/dreamweaver, you could draw the tables really easily in them, then edit the code to work with vBulletin.