Did some work on the base and roof structure.
I added the cross bracing on the base
Then built the sides for the roof structure. To make the posts line up with the base posts I marked positions on the the '2x12' ledger then used a right angle to glue the posts on.
I'm still not sure how I am going to glue the roof posts to the base floor. Every thing is going to be a butt joint. If I had known at the start I was going to make the roof the posts would have been sized to include the roof.