Sorry being a bit thick here, what do you mean hang them on the "inside"? When the old wooden frame is removed next week all the wood will be removed and replaced with plastic, that is what I understand will happen. All I will be left is a two inch gap between the ceiling and the new plastic...
I am having a new pvc double glazed bay window installed in my bedroom next week but am at a lost as to how I will re-hang the heavy curtains. Can I drill holes in the top of the plastic? At the moment I have a plastic track that is screwed into the wooden frame. Any ideas would be appreciated...