Hello,
I offered on this job because I have previous experience in the exact same situation.
I worked with the Festo Company (Germany based) in the migration from Notes Forms to Sharepoint 2010 and 2013.
They had a complete documentation and request system based on notes, along with workflows of course. With great success we managed to migrate.
I used quest, along with a self designed software for the migration.
If you want to chat me, I can also provide references on this work.
Thank you and best regards,
Victor Daicich