UPM/Ascender & Descender values


Working on a typeface where the client wants to have 45 pts on all sides of the glyph basically. It's a monospaced Chinese font. I have the metrics set so 45 pts are on either side for side bearings, I have 45 pts added onto the cap height for the ascender, and 45 added to the baseline to get the descender. The client wants the highlighted text to go below the text 45 pts...but when I export, it won't highlight that increment. What am I doing wrong?

Here is the font info box: