I haven't changed any of the Javascript, but I have added a default.xml in Magento_Checkout Folder which is located app/design/frontend/ConcreteTools/Speedcrete/Magento_Checkout/layout.
<?xml version="1.0"?>
<!--
/**
* Copyright © 2016 Magento. All rights reserved.
* See COPYING.txt for license details.
*/
-->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<update handle="checkout_cart_sidebar_item_renderers"/>
<update handle="checkout_cart_sidebar_item_price_renderers"/>
<update handle="checkout_cart_sidebar_total_renderers"/>
<body>
<referenceBlock name="head.components">
<block class="Magento\Framework\View\Element\Js\Components" name="checkout_page_head_components" template="Magento_Checkout::js/components.phtml"/>
</referenceBlock>
<referenceContainer name="header-wrapper">
<block class="Magento\Checkout\Block\Cart\Sidebar" name="minicart" as="minicart" after="logo" template="cart/minicart.phtml">
<arguments>
<argument name="jsLayout" xsi:type="array">
<item name="types" xsi:type="array"/>
<item name="components" xsi:type="array">
<item name="minicart_content" xsi:type="array">
<item name="component" xsi:type="string">Magento_Checkout/js/view/minicart</item>
<item name="config" xsi:type="array">
<item name="template" xsi:type="string">Magento_Checkout/minicart/content</item>
</item>
<item name="children" xsi:type="array">
<item name="subtotal.container" xsi:type="array">
<item name="component" xsi:type="string">uiComponent</item>
<item name="config" xsi:type="array">
<item name="displayArea" xsi:type="string">subtotalContainer</item>
</item>
<item name="children" xsi:type="array">
<item name="subtotal" xsi:type="array">
<item name="component" xsi:type="string">uiComponent</item>
<item name="config" xsi:type="array">
<item name="template" xsi:type="string">Magento_Checkout/minicart/subtotal</item>
</item>
</item>
</item>
</item>
<item name="extra_info" xsi:type="array">
<item name="component" xsi:type="string">uiComponent</item>
<item name="config" xsi:type="array">
<item name="displayArea" xsi:type="string">extraInfo</item>
</item>
</item>
<item name="promotion" xsi:type="array">
<item name="component" xsi:type="string">uiComponent</item>
<item name="config" xsi:type="array">
<item name="displayArea" xsi:type="string">promotion</item>
</item>
</item>
</item>
</item>
</item>
</argument>
</arguments>
<container name="minicart.addons" label="Mini-cart promotion block"/>
</block>
</referenceContainer>
</body>
</page>
