Handlers oder list module development.

Hi, I am trying to develop a handlers order list module, and I need a help here.

Brief Description:
[attachment=2:1pbg9rqp]order_list1.png[/attachment:1pbg9rqp]
[attachment=1:1pbg9rqp]order_list2.png[/attachment:1pbg9rqp]

What is this module for:
- This module is meant for a factory/manufacturer to present the list of articles available and to take order from registered member group (Retailer Partners) online.

What I have till now:
- I managed to make a this module with very limited function. Owner can form a list of articles to be sold with amounts available. Retailer (having access only after login) can place an oder online. It just send the ordered list as an email to the owner.

Why I need help now :
- My module don't take the advantage of contao widget, as input fields are generated static, and there is no way to validate.

Further improvements :
- Way to store the orders in BE.

Anyone wanna improve this module is welcome
Tenzin
Module is here
[attachment=0:1pbg9rqp]order_list.zip[/attachment:1pbg9rqp]