Can someone with the variable boot floor take some pictures of how the rails are put together? Struggling to find any close ups of the mechanism. 
 

Do the raised boot floors ever come up for sale on the forums? Has anyone tried making a DIY floor to fit the factory rails?

As far as I know they have a bracket to bring them up level with the raised floor. They also have an extra bit at the side to close off the space around the storage compartments at the side.

 

I did a DIY job but haven't raised the rails yet.