I have a 2013 825I without a roof. I didn't get a roof because I was concerned about height of shed entrance but a roof will fit. I’m tired of having rain, snow, and cold air blowing in my face and into gator. Thinking about getting a windshield. I saw a few units with 2 parts and a bottom vent. In the warm weather would like to keep it open. Do you recommend a windshield? If so, what model?