Replacement beds for 88's and older

Hi all
Don't know if this is the right forum for this question or not but I will put it here.
Are they a market for a high quality replacment beds made of fiberglass.
I know how to make molds and work fiberglass.
There may be somebody already doing this.
I have seen so many otherwise good trucks but rusted bad. Some to the point they have made flatbed trucks out of them which is nothing wrong with that but may wish they had a factory looking beds.