Migrate Custom Module Magento 1.9.X to Magento 2.4.1

Question

I have run the data migration tool for Magento 1.9.2.4 to M 2.4.1

All Magento's default tables data is migrated.

Now I want to migrate data of custom modules of M1.

I have followed the instructions mention in this link.

https://devdocs.magento.com/guides/v2.4/migration/extend-the-tool.html

Now I have some queries:

 1. I just need to comment all the data, delta and setting steps which are not required in config.xml file located at app/code/Vendor/Migration/etc/opensource-to-opensource/1.9.2.4/config.xml?
 2. If there is no new table for M2 only so can I remove <integrity> from my modules step in config.xml?
 3. What about <volume> is it required?

Screenshot for point 2 & 3

 4. The custom map file for module will be empty if nothing is there to put into it? Take a look at screenshot:

5. Integrity.php file for custom step for custom module, What will be the values in MapInterface::TYPE_SOURCE & MapInterface::TYPE_DEST

6. Data.php  (in Step/Module/ folder) file's perform function $sourceDocName & $destinationDocName contains M2'table name for that custom module or something else?

7. Volume.php file's perform () 's $documentName contains M2's table name of that custom module?

 8. I only need to run the migrate:data command without -a and --reset or anything else?