My roommates and I have been gifted a brand new treadmill. We have absolutely no place indoors to put it. My roommates are handy, they can frame, insulate, etc. How would we go about building an adequate shelter for it outside? The manual is very clear that it can't simply be kept outside. We have room for a small building in the back yard. We aren't concerned about any heating / cooling or electricity. If we buy a small metal or plastic tool shed and insulate it, will that be good enough? I'm assuming that the primary (or only) issue is the humidity damaging the display electronics or rusting the rollers. We are in Seattle so humidity is absolutely our favorite thing. Thanks for your advice!