John,
The link to the post I gave you is our own Cheoy Lee 41. Forget about using the original anythinig from your current fridge except maybe the door, you will spend more time any
money than it is worth. I made the
interior box from FRP available at home depot. It's inexpensive stuff and easy to
work with. I used
fiberglass cloth to secure all the corners with west sytem
epoxy then painted the
interior with interthane white. My compressor is
keel cooled so it made it possible to locate it anywhere without consideration of air flow for
cooling. We also used the original main door with 4" of added insulation to it and new double
seals as door gaskets. The two top doors are premade from glacier bay if I remember right. They are not
cheap but
work very well, light weight and seal very well. I highly advise having top opening access to keep the cold in as much as possible. One thing I would do differently if I did it again is to not have a spill over fan. I find that during the summer I get a fair amount of
condensation freezing on the evaporator plate in the
freezer which we must defrost monthly. I would separate the freezer and the fridge with a
single plate of
stainless steel and use insulation on the surface to adjust how much
cooling I would want to transfer from the freezer to the fridge. This way I could cut down on the ice build up in the freezer and keep the system running more efficiently. If I remember right, with the 2 new doors the box cost me about one boat unit for all the materials, the compressor system was additional to that figure. If you use an evaporator plate system, use the largest plate you can possible fit in the freezer.
I must say that having a good working fridge on a boat all season is a real blessing.