If you get REALLY bored.

I went to that link. And I am going to be honest. When I think of these units I tend to think of them tied to an old mobile home with Junk piled all around. They simply are not eye appealing to me at all.
Will they work? Sure they will work just fine. But why not add some serious insulation around the jacket and especially the ductwork going to the house.
Make them look like something they are not.. I realize this will all add to the cost. But boilers are not for everyone. There is a niche for these units. But I think if one was to make them more eye appealing they would sell much better and maybe even give the seller a little more markup.