Punching a hole through Magento Full Page Cache correctly - php

Question

I have been pulling my hair out over trying to get a hole punched out for the price block on the product page. I have looked at numerous sources, including some from you good people at stackoverflow, but I have been getting a fatal error, so something is incorrect. Here are some sources that I used:
http://invisiblezero.net/magento-ee-punch-hole-in-full-page-cache/
http://www.kingletas.com/2012/09/how-does-magento-full-page-cache-works.html
Magento full page cache
Trying get dynamic content hole-punched through Magento's Full Page Cache
How to implement magento cache hole punching for shopping cart block
As you can see, I have been all over, and I have read more in addition to this but some of them conflict a litt, and I think that is where I have my issue, now let me post some code for you.
cache.xml
<?xml version="1.0" encoding="UTF-8"?>
<config>
<placeholders>
<SpecialPrice>
<block>catalog/product_price</block>
<name>product.pricing</name>
<placeholder>CATALOG_PRODUCT_PRICE</placeholder>
<container>MyStore_SpecialPrice_Model_Container_Cache</container>
<cache_lifetime>8640</cache_lifetime>
</SpecialPrice>
</placeholders>
</config>
cache.php
<?php
class MyStore_SpecialPrice_Model_Container_Cache extends Enterprise_PageCache_Model_Container_Abstract
{
/**
* Get customer identifier from cookies
*
* #return string
*/
protected function _getIdentifier()
{
return $this->_getCookieValue(Enterprise_PageCache_Model_Cookie::COOKIE_CUSTOMER, '');
}
/**
* Get cache identifier
*
* #return string
*/
protected function _getCacheId()
{
return 'CATALOG_PRODUCT_PRICE' . md5($this->_placeholder->getAttribute('cache_id') . $this->_getIdentifier());
}
/**
* Render block content
*
* #return string
*/
protected function _renderBlock()
{
$blockClass = $this->_placeholder->getAttribute('block');
$template = $this->_placeholder->getAttribute('template');
$block = new $blockClass;
$block->setTemplate($template);
return $block->toHtml();
}
}
congig.xml
<?xml version="1.0"?>
<config>
<modules>
<MyStore_SpecialPrice>
<version>0.1.0</version>
</MyStore_SpecialPrice>
</modules>
<frontend>
<events>
<catalog_product_get_final_price>
<observers>
<MyStore_SpecialPrice_Model_Observer>
<class>MyStore_SpecialPrice_Model_Observer</class>
<method>setSpecialPrice</method>
</MyStore_SpecialPrice_Model_Observer>
</observers>
</catalog_product_get_final_price>
</events>
</frontend>
<admin>
<routers>
<SpecialPrice>
<use>admin</use>
<args>
<module>MyStore_SpecialPrice</module>
<frontName>SpecialPrice</frontName>
</args>
</SpecialPrice>
</routers>
</admin>
<global>
<models>
<SpecialPrice>
<class>MyStore_SpecialPrice_Model</class>
</SpecialPrice>
</models>
</global>
</config>
snippet from local.xml
<reference name="right">
<block type="catalog/product_price" name="product.pricing" template="catalog/product/product-price-block.phtml" before="-" >
Let me know if there is anything that jumps out to you.