Thanks to everyone who has posted here. The information provided is invaluable. Finally, after fighting with this for months, I was able to create a completely custom SI5 titleblock using the expert advice given above.
In one of the articles, a very powerful formula is provided for auto scaling text in your titleblock when the drawing scale and/or page size changes:
X pt*ThePage!PageScale/ThePage!DrawingScale*Height/Y in
This formula is entered into the
Character> Size field of the individual text object's Shape Sheet. In the formula X equals the original point size and should be entered with the
pt suffix and Y equals the original text object height in inches.
The Visio Guy does a stellar job of describing this process in detail. I recommend that you read his tutorial on the subject thoroughly.