I decided i would have a do at the interior of the freezer cabinet, realised straight away that it was too narrow to have the pull out "chilled" section and upright fridge/freezer, so it is in affect all new (ish), This is what i have so far :-

The plastic bins in the freezer section and the door shelves are(were) walls and floors, the supports for slides are shapes, 40mm walls provide depth for insulation with 35 on the freezer door and 20 on the fridge door.
The wire mesh shelves will probably be changed for glass and i am not sure about the light source, not convinced this on turns off.

MIke