We have a 1990 Hunter 335 and I want to change over the current ice box to a built-in refrigeration unit. We want to install the top loading models that have been installed in some 335's and other Hunter models. Does anyone know the manufacturer of these built-in units? Any details for installation or insulation (ours is next to the engine compartment - yeah, I know)? Draw backs? We do not care for the current ice box because: (1) it is very unfriendly for storage in the rear of the compartment and (2) we're fed up with the concussions caused by the lid falling while in digging the box. Appreciate any help.