Migration from AX 2012 R2 to NAV

Hello,

I am already aware of the differences between the 2 products (AX vs. NAV) . Has anyone migrated from AX 2012 R2 to NAV ? Just wondering what would be involved in the  backend (ie: databases ,tables, customizations) to move from AX database and model store to NAV. I'm not familar with with the NAV backend other than it  primarily runs on .NET architecture running atop a SQL database . Any help would be appreciated.

Thanks!