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
The sisters' zany style seemed to have let them down this time. Will they gain ground next week?