Thank you for your reply.
About n.4 doubts :
a) can each vendor offer more than one shipping option ?
b) can buyer choose from more than one shipping option for a product from a vendor?
c) In a multi vendor cart, i.e a cart with products from more than one vendor, the buyer will see one shipping parcel, or he will see one shipping parcel for each vendor’
Thank you again
I’ve join your link