Don:

You are travelling on the fast train...slow down a little.
There is only so much that can be illustrated on one drawing effectively.
You are now aware of a numerical sample of pi, now you need a sample of unity right?
First, I want you to set yourself into the designer's seat and ask yourself why you would spend all of your time just to illustrate a ratio compared to unity.
By using the 1.23456789 (that may have actual been 1234.5 units) they provide two elements of math in one go...the numerical series and pi.
But...since you insist in wanting to see unity...I'll do another drawing and upload later this eve.

Best.
Clive