I would change timber sizes a number of ways just based on a visual evaluation and then calculate to verify.

Increase posts to 8 x 8.

Increase ties to 6 x 10 on gables and 8 x 10 in center.

Decrease rafters to 3 x 6.

Increase plates to 6 x 8.

Add upper level braces.

Extend rafters at peaks to create overhand.

Bracket support the upper end of the lower course rafter on the overhang.

Last edited by Roger W Nair; 06/07/12 01:26 AM.