I have just put some drawers and a fridge slide in. I had a new floor made up out of ply and secured it by a single threaded rod which screws into the hole that secures the spare. A single 21mm nut in the centre of the floor keeps it tight. I sourced a single drawer from
http://www.affordable4x4drawers.com.au/ and a fridge slide from Uneek. If I need to get at the spare I remove the drawer from its box and take the fridge out. The floor is then light enough to lift after I remove the single nut. Bit of a hassle but hopefully I will never have to do it!
The drawers are made out of ply and custom made to size by Andrew at Affordable. Great job and very reasonable price.
Cheers
Paul