Looking for some suggestions as I'm having some difficulties with a left vertical navigation site. Ideally I want the master page to hold header, footer and main left column navigation, which itself isn't that difficult. What I'd like to do is have an webpart area below the navigation as well as the main content although I'm unsure how to put this into place with the page placeholders and layouts. What I tried initially is below although I was unable to see the zoneLeftContent webpart area to add/remove webparts to the template. I was only able to add webparts to the zoneMainContent webpart area.

<div class="header">
   Header here
</div>
<div class="page">
  <div class="leftColumn">
    <div class="leftNav">
      <cc1:CMSWebPartZone ID="zoneNav" runat="server" />
      <!-- added nav webpart to this zone -->
    </div>
    <div class="leftContent">
      <cc1:CMSWebPartZone ID="zoneLeftContent" runat="server" />
      <!-- added page placeholder to this zone -->
    </div>
  </div>
  <div class="rightColumn">
    <cc1:CMSWebPartZone ID="zoneMainContent" runat="server" />
    <!-- added page placeholder to this zone -->
  </div>
</div>
<div class="footer">
  footer stuff here
</div>

Do I have to setup a nested master page or layout? Any suggestions as to how I might go about setting this up would be great.