Fabric is maybe not the best choice it's just the PVC typical for automotive tarpaulin. It's easy to get, easy to fix, quite cheap, easy to clean, waterproof but I'm e bit worried about its wear on bends .. any way we will see.
It's just stapled to the wall.
Than on top of it comes masking strip, between strip and the roof I put some butyl sealant.
(On the picture below not painted yet and without corners finished.)
Roof is quite heavy 60kg plus .... but what to expect of wooden frame, and it's exactly as I calculated before doing it.
Anyway I decided to do it this way and give it a try.
To help opening it I calculated springs and found company to made them for me. Springs balance about 35kg of roof weight so it's left for me to lift about 25kg. You opening it side by side so it is not so bad .. but it is not so easy. I am not very happy of this. Maybe one day when I get my hands on a TIG welder I will rebuild the roof using aluminium.
If you back up to the foto of me with the bottle of wine ... you can see above the window two of total sixteen springs.