Hello Richie Rich- I've got PH roof bars on our galaxy, but i'm sure they cost just over thirty pounds (didn't upgrade to locking devices though). I had a friend make up a metal frame (1m x 1.5m) covered in 6mm marine ply which I then bolted on to the bars. Once sprayed with plasticoat, and stained wood it look a treat! I had four large suitcases laying flat, and pushchair on top during our summer hols which left plenty of room inside for 6 people.