This will not be compatible to mount directly to an M-Lok Handguard.
It will as long you have a picatinny rail section on the bottom of your handguard.
Yes, it should as long as its secured properly on the rail and when adjusting the bipod.
Yes, as long as you have a picatinny forend to attach it to.
It's personal preference according to what height you'd like the forend.
It can be mounted however you would need to add a sling swivel stud to the factory stock of the Mini 14.
Yes, here are links to an MLOK and a Keymod aceesory rail:
https://www.opticsplanet.com/leapers-utg-pro-m-lok-picatinny-rail-section-rejel.html
https://www.opticsplanet.com/leapers-utg-pro-1-57in-4-slot-keymod-picatinny-rail-section-metsq.html
BP01 weighs 13.3 oz., BP02 weighs 12 oz., BP03 weighs 15.3 oz.
Yes, the swivel stud adapter will have an additional stud to make up for the one that is being used by the adapter.
It will, but you will need a picatinny adapter for your keymod handguard. The keymod to picatinny adapter only needs to be about 1 inch long, but can be longer of course.