I just pulled the windows and reused the screws. I added some self tappers at seems to reduce the distance between screws. If I ever have an issue I can unscrew and repair if required. simple. It is wedged up under the lip at the top, and the seem between the two pieces of sheet matches up with the seem in the body panels.
It doesn't look great yet as the sheet metal is still in primer, but once I get a coat of paint on it and the bus is all one color I think its gonna look pretty clean. Knocked it out in a day. Under $100.