Polyhouse is type of  advanced agriculture where you can increase production by creating same modified climate by covering a steal or bamboo structure with UV stabilized (200 micron) film. Polyhouse building is still suppose to be a difficult and highly skilled work so that consultancy charges are too high and its not possible for Indian farmer to build it by using locally available inputs . But now its not true by using given AUTO CAD designs you can build your own polyhouse by using  local fabricator  that’s also in less than 50 % cost, so try this and build your own polyhouse . (all measurements(Polyhouse digrames )are for 12*22 M sized polyhouse)
For detailed drawings nd construction steps please follow link – Polyhouse report