Have you discussed your concerns with the guy/gal who drew your plans?
Did he/she do all the calculations?
He/she should have in order to correctly size the beams, posts, rafters, king post, and ridge beam.
Are you planning on having a second floor deck?
Is there storage being planned up there?
There are lots of questions about your design that you need to discuss with him/her and see if he/she understands your loads and wishes.
