They have aluminum wall and roof frames
GS is not out of business. But does not build Class A motorhomes at this time. Ford V10 from that year were good.
Guardian glass can do most MH windshields.
http://www.rvglassparts.com/
There are many MH manufacturers that went out of business over the years. But their products are still being used and repaired.
Most appliances are common amongst all manufactures.