BODS 3.2 to BODS 4.0 Rapid marts Target database Updation

Dear Friends/Experts,

I am above to upgrade BODS 3.2 to BODS 4.0.Before moving to upgrade process I need your assistance to clarify few doubts

1. How to check whether BODS 3.2 has customization in existing  Rapid marts.

2.During the process of BODS 4.0 upgrade.For target data base Should I take the existing means already created Database(in BODS 3.2) or Shall I create a new database  for BODS 4.0 Rapid marts

3. if I want to take existing database.How can I avoid deploying data file (content of Rapid marts) to avoid creating new schema in exiting database

4.will there be any schema additions or reduction in BODS 4.0 Rapid marts content compared to BODS 3.2.

Please share more ideas or experience if you come across with BODS 4.0 Rapid marts deployment,also process of rapid marts customization and pain areas during deployment

Thanks in advance  !

Source:  ECC 6.0

Target  : MS SQL Server 2008

ETL       BODS 3.2( 11 Rapid marts)

Reporting : BOXI 3.1 (Webi)

Thanks & Regards,

Fasi