I am ACTUALLY doing this build myself.
This is the old back door of the original house. It’s now an alternative doorway to our “futility room”, but we don’t use it.
I’ve had the idea for ages to make it a little set of “pantry” shelves.
And despite nothing in this godforsaken house being straight – the doorway height varies by 27mm front to back! – this thing is LEVEL IN BOTH DIRECTIONS!!!! 🙌💪