So cheap it's sad..........

I inspected a 95 BMC a month ago for a client, sides were definitely steel, caps are fiberglass. The example had 150k miles, original Cummins/3060, perfect inside with no squeeks or rattles, quick, sweet and silent running down the road.
I believe glass caps were employed after 89 or 90. If there was ever one built with laminated side walls, I'd love to see.