add, delete and update from frontend

[Firmaconnect.net]

In prestashop admin have the option to change orders, by adding new products, change the quanitity and delete.
Please see this link.
http://prntscr.com/7bteh5

We need to build this as a frontend feature in one of our shops.
Under my orders and details
http://prntscr.com/7btjif

you can view the project you ordret, here we would like the option to add, change or delete products
http://prntscr.com/7btkcj

How ever this option should be closed if the customer do not change 2 days or more before delivery date.
http://prntscr.com/7btlhd

This is an ASAP project and will be build on a testserver before moving the code to live.

What would the prize and time be on this project?