The sisters also took the judges' comments from last week on board and delivered an amazing home office and entertainment room.
Katrina knows the value of a quiet place to work, away from the noise and confusion of a busy family home: "That's why we've built these two mirror image work stations. There's more than enough desk space, drawers and overhead shelving."
The work areas were impressive, providing self-contained study/work nooks for two adults or students. Each work-station was backed by a painted black-board wall, a quaint piece of old-school (pardon the pun) charm.
The room was dominated by another of the girls' industrial themed components — massive silver-fronted storage shelves running from floor to ceiling.
The sisters also remained on-brief, finishing the room with a very confortable second-hand recliner chair and foot stool that Amie was particularly proud of: "I love the olive green. It ties in with our other room and provides a nice splash of colour against the industrial shelving."
Of course the chair was positioned to view the recycled flat-screen TV, mounted on the rear wall.
Katrina and Amie felt confident their second room ticked all the boxes.
John and Neale viewed the room as if they were a couple of headmasters scoring exams. Would the girls pass or fail?
John had definite ideas about what works for buyers: "One thing I know is this: buyers will always perceive a room as it's presented. Here the sisters have committed to a home-office. Buyers will have a hard time envisaging it as a bedroom, so they've immediately lost one in the total room count."
Neale was also concerned by the layout: "That huge silver shelving unit in the centre will make it hard to change the room back to a bedroom."
Despite liking the window blind, both judges thought the girls had taken a step back from their stellar delivery of the first week.
Neale summed up their consensus: "While some elements, like the storage units and work stations, work well. Overall this room feels like it hasn't been thought through enough."
The judges' verdict
Design: 5 Execution: 5
The sisters' zany style seemed to have let them down this time. Will they gain ground next week?