I like the MS so well on the GL1800, I am in the process of making one from scratch for my 1995 BMW R100RT 'Airhead'. A fellow Airhead rider has already approached MS about making them, but they declined, saying they prefer to focus on newer motorcycles. I bought a MS mount off eBay, and have several old windshields on hand. Only problem is the base, which has curvature unique to the RT. So I plan to use the RT's windshield bottom section as a base, at least temporarily for R&D. Will attempt to mimic the angles from the MS setup on the GL1800.
TMI maybe, but that's how much I like the GL1800's Madstad, willing to go to the trouble to fab one for the BMW, or at least attempt to.