Ian goes on the hunt for his biggest build yet.

Ian kicks off the build with some crazy concepts.

Ian gets rolling on the challenging car design.

Ian jumps right into building the back of the car.

Ian works with a wild idea for the rear design.

Ian builds with a variety of parts to design the new front end.

Ian tries to turn a crazy concept into reality while he completes the front end.

Ian builds through a major issue with the roof.

Ian tries to bring it together with the side panel design.

Ian creates his custom carbon fiber mold for the custom car project.

Ian puts it all on the line to see if the custom car mold works.

Ian runs into issues as he attempts some last minute changes.

In this Season Finale, Ian tries to bring it all together. Season 4 Finale.