wood with a fiberglass overlay
Fiberglass has been used for decades. The original 1953 Chevrolet Corvette body was made of fiberglass. The Glasspar G2 built in 1949 was made of fiberglass but they just made bodies not a complete car. The Kaiser-Darrin 161 built in 1954 was also fiberglass.
It is made out of plastic.
Fiberglass is literally made from the fibers of glass. It is generally used to reinforce plastic products. Fiberglass is simply glass fibers used to reinforce a polymer. You can even create fiberglass designs at home.
a fiberglass
Fiberglass grating is made to look similar to metal grates in industral use, but since it is made of fiberglass it is corrosion and impact resistant. Fiberglass grating has low electric and heat conductivity and can be made strong enough for fork lifts or even trucks to travel over.
Fiberglass shingles are lighter and thiner with there base being made out of fiberglass. The fiberglass shingles will cost more but wear better.
Fiberglass
Fiberglass
Some can be. They are usually made of metal and plastic. I have seen a few fiberglass ladders though.
Neither, it is plastic.
The bodies, if that's what you mean, are made of fiberglass.