I think there's a new bug at the cover stage.
The dimensions required are (15.941" X 9.931") Lulu provided these at the cover stage.
The template I get at the end is a over 10" in width (see attached screenshot please.)
Also, I uploaded a revision about 5 times, without the words Large Print Edition -- and it is still showing the old one.
Would someone kindly have a look?
Lulu generated template below: