I think you are getting a good handle on what is available and how to plan the repairs. As we would all have to do. Good approach.
Get the parts, lay them over the area they go and think on it.
The general idea is not to cut out more than is necessary, Not to use any more of a patch panel than is necessary. You may have to brace the cab so it does not move when things are cut. Take many measurements before starting.
Watch this.