One possible solution is to use small drawn squares on page 69 and large drawn squares (with the same line texture) on page 63.

A rough rule of thumb for how big to make the squares that an answer is to be written in might be two cells wider than the correct answer will be and one cell taller than a braille cell (i.e., draw the top box line half a braille cell above where the answer will be written, and draw the bottom box line half a braille cell below where the answer will be written).

Let me see if I can get some input from a “boots on the ground” teacher about this, too.

–Kyle