I can see room for several questions and answers:

A:  Software.  Sure, this is a moving target, but softwarerecs doesn't work.  This answer should distinguish between programs that attempt to recover data, and ones that try to rebuild the partition table.

B:  Hints.  This is a set of answers about signature values that can be searched for with a disk editor to try to determine the original layout of the disk.  E.g. is the first sector of an HFSJ+ partition unique?

C:  Resources.  Links to other web pages that may help.