Let' s say for 200 fields at a high level how many business classes that we might need to change...Please let know. How much of reusability % that we can factor in ?

already referred the doc. My question is Can we automate unit testing in cache ?

Please find my answers in line

Scope : Movement of config and its dependencies across DEV , TEST and PROD Environments. This has to be automated with config setting details

What configuration do you want to manage? ----

Users/Roles/Resources? ---- yes

Namespace mappings? ---------yes

Memory/CSP settings? - Not required for now

Globals, Routines