The unit I am working with is a Haier 8000 BTU from Walmart. http://www.walmart.com/catalog/product.do?product_id=5402964.
Yours might be different but the idea is the same.
1/4" Rubber Foam Weatherstrip
Window screen frame
Plexiglass - Home Depot
Screws, self drilling, 1/4"
C-channel Aluminum pieces 3/8' and 1/2' sold in 8' length
Silicone - Home Depot
Nut Rod Coupling and a screw that fits.