If you are rebuilding from scrach consider getting the installation manual for your ref. Most manufactures require a 1 in. MAX clearance behind the ref.
I installed a sheet metal wall behind the ref. to attempt to meet the convection requirements across the coils. This is an easy task while rebuilding.
I also padded the side walls of the enclosure with insulation covered with a thick plastic sheet to produce a air tight fit, a pillow. This is to insure the side walls of th ref, do not see the increased temperature of the heated area behind the ref.
During the summer months if you touch the wall behind the dinette it will be hot.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles