Garth is challenged to create a modern, spacious deck while maintaining a log cabin feel. His plan includes redoing their entire wrap-around porch with steel framing and maintenance-free decking, adding a rounded section with a fire pit and expanding the main area to become a fully enclosed glass living space. But, the team is thrown for a loop when the homeowners completely change the design plan with three weeks to spare. Add in weather challenges, rotted-out material and last minute crew changes and this Mega Deck just barely finishes in time.