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That is really looking good!! How about some inside shots when you get time??
Not looking to cause any arguments here but just from my own experience of towing my wheel house the front of my wheel house does get caked with road grime (slush / mud / dust). With the location of your furnace my concern would be the air intake and especially the exhaust port getting plugged. If your intention is to leave your unit on the lake then snow dust may also become an issue. Just my two cents worth! Nice build by the way!!!