Good evening & welcome to our culinary club & happy to meet you. If I understand your request you wish to convert the recipe in Miss Rose’s TCB as you identified so that it will fit in a full sheet pan???
Well my friend I should know the size of a full sheet pan…being a amatuer at all this I think it is 18 X 26, X 1 inch if it is so I will post the actual size. & how much batter will fit allowing a 50% full due to the expansion in volume of the chemical leaveners.
16.8 X 24.5 X .8 inch. = 20.5, cups. or 10.25 cups X 8, oz per cup =82, oz.
The recipe weight is 42.75, oz…so you need to do a 2X the recipe.
If this size isn’t what you wanted to know post back with the size in inches & I will recalulate it again for you.
Good luck in your baking project. Enjoy the rest of the day.