The next step is to form the roof, as before I am trying to use as much timber from the wood as possible, but knowing how difficult it would be to try and mill the timber to standard lengths it was just a lot easier to buy in what I would need, saving time and money.
So the roof will consist of 5 sheets of ply and about 70mtrs of 4×2 with about a 4 inch fall front to back for the rain to run off.