The "outside view" of your new dream deck breaks down into -
Three parts:2) Fascia/Rim,
I want to focus on 1) Support posts, and 2) Fascia/Rim.
I will look at 3) railings next time.
Number one: support posts
Upgrade options to the standard 6x6 treated posts:
Here is a couple picture of fascia details on wood decks.
A cedar deck with triple stack fascia with solid skirting