Here's a question for all you hot-shots around here.
How do you replace a door slab when the opening is hour-glass shaped and there's no straight or square point of reference?
1 - The "X" axis is hour glass shaped, meaning the center of the door is narrower than the top or bottom.
2 - The "Y" axis - front to back - show's plumb.
3 - The existing door was a former dutch door, meaning two halves and four hinges. The halves were permanently connected into one door, but the 4 hinges remain.
4 - The replacement door panel is a full glass door with a 6" wood perimeter.
You only have a 48" level, measuring tape, and plumb bob to work with.
Bonus question: How long will it take you to install the new slab into the existing opening with the existing hardware, and how much do you charge for your services?