Any comments on what I am planning would be appreciated.
I see that the MM Abstract Factory is Table driven. I have some additions/changes to make to the default values to this table. However I do not want to make the changes to the actual table because when I upgrade from MM 7.0 to 8.0+ there may be changes that I want to include and I do not want to find and make the changes to several Apps.

Therefore I am thinking I will:
1) Create an additional _Classes table where I will enter overwrite and new records
2) Subclass the Abstract Factory and modify the code to attempt to find the record of interest in the _Classes table first and if not found, try the MM classes.

In order to do this I will have to understand MM Biz Objects better to see how I can have 2 Biz Objects on the form, or how to get the current Biz Object to work with two possible data sources.