Joe,
There's no stone just wavey brick, mortar, wood framing, flashing tape, cedar wood siding. In the previous post, I included a picture #4 of an existing window to show how it was finished out, but it doesn't have the cedar wood siding around it - hence the challenge.
I've been checking out remodeled buildings around here. They do create a slanted brick sill. Some brick the sides with mini bricks and some just put wood all the way around and use caulk/construction adhesive to fill in the gaps around the boards.
We are just trying to perfect our style before installing the 35"X76" picture window. That one will be bricked all the way around.
I a picture of new construction house which doesn't have a slanted brick sill and has wood look around the opening. I couldn't attach the picture, but the website is:
http://www.modernmouldings.com/
It's the red brick one story before picture and not the after.
Our house has a large overhang, many trees, and the wind doesn't normally come from that direction (except for a hurricane when all bets are off).
We're still trying to think it through. What do you think?
Today I'm picking up some of the green lid joint compound you suggested and going after the bubbled up taped and feathering out 8". I'm also attaching a picture of the patched job on the ceiling where we took out a wall. It needs a lot of work.