MegaMaxx UK™ Shipping Container Foundation Concrete Base Mold These Shipping Container Foundation Concrete Base Molds from MegaMaxx is an easy way of creating concrete base foundations for placing Shipping Containers on. The shuttering form mould can ensure you create a perfect square footing of 300mm sides by 220mm height. The forms come flat-packed, allowing you to easily assemble them with the provided screws. Also provided are 2, flat mesh-like panels which offer additional sturdiness when installed. You can easily create foundations for shipping containers or other large items by assembling the form, shovelling it in with some ready-mix concrete (available from Wickes) and letting it set.