I did something similar on my boards just by editing the showgroup (http://www.overwhelminghate.net/forums/showgroups.php) templates.
It involves some basic HTML and adding some custom profile fields.
My showgroups_group looks like this:
<table cellpadding=0 cellspacing=0 border=0 bgcolor="{tablebordercolor}" align="center" width=100%><tr><td>
<table border="0" cellpadding="4" cellspacing="1" width=100%>
<tr bgcolor="{tableheadbgcolor}">
<td width="100%" colspan="6"><normalfont color="{tableheadtextcolor}"><B><img src="{imagesfolder}/vb_bullet.gif" align="absmiddle"> $bbtitle $groupname</B></normalfont></td>
</tr>
<tr>
<td bgcolor="{firstaltcolor}" colspan="2"><smallfont>Username</smallfont></td>
<td bgcolor="{firstaltcolor}" colspan="1"><smallfont>Level</smallfont></td>
<td bgcolor="{firstaltcolor}" colspan="1"><smallfont>Class</smallfont></td>
<td bgcolor="{firstaltcolor}" colspan="2"><smallfont>Race</smallfont></td>
</tr>
$adminbits
</table>
</td></tr></table><br>
and my showgroups_adminbit looks like this:
<tr>
<td bgcolor="$backcolor" nowrap><normalfont>$onlinestatus</normalfont></td>
<td bgcolor="$backcolor" nowrap width=100%><normalfont><b><a href="member.php?s=$session[sessionhash]&action=getinfo&userid=$user[userid]">$user[username]</a></b><br>$user[avatar]</normalfont></td>
<td bgcolor="$backcolor" nowrap><normalfont>$user[field6]</normalfont></td>
<td bgcolor="$backcolor" nowrap><normalfont>$user[field5]</normalfont></td>
<td bgcolor="$backcolor" nowrap><normalfont>$user[field7]</normalfont></td>
<td bgcolor="$backcolor" nowrap><normalfont>$sendpmlink</normalfont></td>
</tr>
Think that's the only changes I made, except for adding the relevant profile fields and removing the moderator part - as I don't have any moderators...