I have came across bamboo green house concepts.
Apart from vendor Thousandpetals there are few people in Bengal who have expertise in this area.
PLease share your experience in this if you know some one is using bamboo poly house.
Cost is almost 1/3 of normal GI pipes and hence more affordable and more easily scalable.
i am thinking of putting this in Bengal where its hot and humid climate, so any member having prior experience can share their inputs.