|Mitre gauge is set at 40 degrees|
|The braces are left long at the moment.|
As this exposes a lot of endgrain, engrain glue joints not being very strong, each end will have a #20 biscuit slot cut into them. A corresponding set of biscuit slots will be cut into the top of the bottom rail and the underside of the mid rail. Then the lower rail could have its top face bevelled to aid rain water run-off. A straight portion was left at each position where the bevel mates to the lower rail.
After initial glue up the braces will be trimmed to their final length and glued into place with the biscuits.