I've been researching installing a refrigeration system in my boat. All
the the information I've read says to have 4 to 6 inches of insulation
for the refrigerator and freezer.

I've been looking at the WAECO Alder/Barbour RPD-190 refrigerator. It
only has 2 inches for the freezer, and 1 inch for the refrigerator.
Would it be effective to build an insulated cabinet to install the unit
into?

Also, has anyone had experiece with this unit?