Building the rough opening was the easy part... the trim, the A/C mounting methods and the cold-weather cover were the hard part..
The proper way to work on a steep roof is to install roof scaffolding consisting of metal brackets (roof jacks) and 2x10 planks.
Cope-cut ends are more work than simple miter-cut ends, but the results are far superior.
Before hanging drywall, there is an opportunity to improve energy efficiency for a modest investment.
This simple deck project involved handrails and stairs.