Step 1
Mark out your shapes and draw on to a piece of ply. Making a template out of thin MDF will give you exactly the same curve for each piece (later on I'd wished that I'd taken the time to do this).
Step 2
Cut out all your roof pieces. I made two bottom plates which go on the posts, two beams which rise from each end to the middle and a pair of rafters which rise from the sides and sit under the beam, filled in with ribs.
Step 3
Cut packers to go between each curved shape. Space them out and glue them to the bottom wall, then glue and place the top wall. Don't be too zealous with your clamping, just make sure there is good contact, as too much pressure will starve the joint of glue and make for a weak bond.
Step 4
Cut a series of 50mm strips out of ply for the top and bottom sections. For tight radius curves, layers of four 4mm ply may be necessary. Make sure each layer is completely covered in glue. Once the shape is formed, sand and paint with at least four coats of paint.
Step 5
To erect the fale, set the roof out on the ground and mark out where the posts should go. Dig holes and insert the posts. I used 100mm x 200mm sleepers from Bunnings. A spacer made out of boxing helps set the posts at exactly the right distance apart. Level and trim posts.
Step 6
Assemble the roof base plate section on top of the posts. Screw together using coach screws. Attach to the posts using coach screws and galvanized brackets. Add horizontal ribs to support the roof covering. If you want more shade in your fale, line it with mulch cloth and top with light brushsticks.