Is there a way to get the blank size into a custom property?
One way that you can get the overall length and width dimension is by adding reference
dimensions to the flat pattern in the drawing. The reference dimensions have a set name (Ie.
"RD2$Drawing View1"). Pull down the "File" menu and pick Properties. Create your property names.
I used "flat length" and "flat width". For the Value, enter the appropriate reference dimension
name. Now when you create a note and Link to Property, you can use your new properties.