But it will be rewarding knowing it is done correctly

I will tomorrow, I had better check up the back to make sure there hasn’t been any other damage first.

All good, I don’t think I know what I am doing so that’s why I over engineered any structural changes and repairs.

I think you are looking at the interior frame and not the external existing frame, with fully supported oversized headers. I have narrowed the original window openings while still leaving the hardwood laminated headers in place. The trusses land on hardwood blocks in the outer wall.

Take a guess.

Hopefully you feel better tomorrow…

It’s definitely too big for the room.