1) If I remember correctly it was a clean install of 4.1.0.
2) There are quite a bit of modifications and around 30-40 different metaclasses and attributes of different types. Do you need further description of the metastructure?
3) The script is from the full source code download package of version 4.1.2. I ran the script following a successful run of ECF4.1.0_to_4.1.1_upgrade.sql and ECF4.1.1_to_4.1.2_upgrade.sql which I ran according to:
http://docs.mediachase.com/doku.php?id=ecf:41:tutorials:upgrading4) The SQL server I'm running the script on is on Windows 2003 and SQL Server 2005. This is the test environment. The production environment is on SQL Server 2008.