Very simple project... You will need sheet metal cutters and a sheet metal vise grip or pliers to bend the sheet metal. I bought a bunch of new old heater cores off fleabay for $7 ea. The heater core is 6" x 10" and the heater core cooling fin area is 6" x 8". IMG_2119 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM IMG_2120 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM I first cut out the sheet metal to the detentions I needed so it exactly fit the heater core. IMG_2125 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM Then I bent up the sides so the sheet metal encased the heater core on one side.. IMG_2126 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM IMG_2128 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM Then I used a 8" duct take-off, drew out my circle, cut it out, and installed the duct take-off. IMG_2135 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM Because the heater cores I bought was 6" x 8" I used 1" styrofoam to take up the space. IMG_2130 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM IMG_2130 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM The backside of the heater core in the sheet metal box after adding the 8" duct take-off. IMG_2134 by baldwincaregiver posted Aug 27, 2017 at 9:20 AM Then I cut out the front side (lid) of the Icebox and again installed another 8" duct take-off... 20170824_094137 by baldwincaregiver posted Aug 26, 2017 at 10:22 PM I used silver foil duct tape to seal the front and back pieces... Bingo Bango.... You have a DIY Hydro Innovations Icebox 20170824_095154 by baldwincaregiver posted Aug 26, 2017 at 10:22 PM 20170824_095207 by baldwincaregiver posted Aug 26, 2017 at 10:22 PM 20170824_095223 by baldwincaregiver posted Aug 26, 2017 at 10:22 PM 20170824_122831 by baldwincaregiver posted Aug 26, 2017 at 10:22 PM Bolt