q2: alter database ... file = new directory and filename

q3: alter index and table with option on to select on which filegroup it should be stored

q5: the cluster itself will...

yes they are commands for the old version replaced by the attach_rebuild_log. But anyways I missread the post since it's asking to restore the mdf not the ldf file. 🙁

try the create database for attach_rebuild_log command this worked out fine for me as did they dbcc rebuild_log in the past