Dokan Multivendor extension Custom Development.

HI! I am Using The Wedevs Dokan Multivendor Extension. I Need to add few things on it. 1. We have various type of product in my site & with various Measurement Unit EX: Kg, Dozens , Pcs, Ton . so when Vendor add or edit products from frontend dashboard there should be a dropdown option for the unit. SO vendor can select the unit and displayed on site like this : $2 / kg & also on Stock quantity : 100 kg Left. 2. we have some seasonable products. So I wanna show something like This : [login to view URL] . add a calendar on add/edit product section for product availability date. as like: This product available 01/02/2018 to 12/06/2018 Answer This Question on Your job Proposal. ** Do You have any experienced with Dokan. ** Do You Have used Dokan Before? ** Any Site Developed By You Without This Questions Answer Proposal Will be rejeted. Thank you