Seems to be based on this design: https://www.motherearthnews.com/diy/solar-food-dehydrator-plans-zm0z14jjzmar/
or as pdf here.
Seems to be based on this design: https://www.motherearthnews.com/diy/solar-food-dehydrator-plans-zm0z14jjzmar/
or as pdf here.