These were hand built from the inside out and the last thing that was fitted was the alluminium exterior skin. Most of the fixing screwheads are in the external wall cavity.
There may be some fixings to the floor using L shaped brackets but that is about it.
I used a feeler guage and slid it between the wall and the cupboard support to 'feel' for the screws and then usen fairly thin plastic wedges either side of the screw to allow me to slide a 'junior hacksaw blade (Pin removed) in the gap and cut through the screw.
Its not easy but it worked for me.
Refixing the cupboard can be done with angle brackets or kitchen unit plastic jointing blocks
GB in Wales-CC18017873
March 2013