If you are going to make it yourself then you will have to work out how you
vent it.
You will have less light, depending on the sheeting you use, small profile
sheet will cut out more, not so good in the spring, but will give a measure
of shading in Summer.
Make sure you have sufficient supports to hold it up, and to keep it down,
in strong winds.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk