Carefull removal of cabinets (1968 Oxford Crusader 15")

by Mark
(New Zealand)

I have a 1968 Oxford Crusader 15" caravan and am endeavoring to remove the cabinets in a fashion in which they can be re-fitted. I would like to take care not to damage anything along the way but can't seem to figure out how exactly they are fixed.

I have discovered the points in which they appear to be fixed to the wall of the caravan yet am unable to determine what sort of fixings these are and how i go about undoing them.... Is anyone here able to share their wisdom with me please? Cheers, Mark