If there's no heavy weapons to contend with, why bother going up two levels and have to fill the interior?
Line the outer top edge of the containers with barbed wire with a wall of sandbags just inside the wire. That should leave a space for a walkway/crawlway. A few ladders scattered about and you've got access.
Another line of two of barbed wire outside should slow any attackers down enough for the oversized crossbows and heavy flamethrowers to deal with! (sorry, had a Mad Max 2 moment there...)
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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