Development of the module under Laravel

Good afternoon.
We would like to install such a module on our projects https://nexoos.ru/vamshop/moduli-vamshop/messendzh... (description, functionality, appearance).

If you have high karma on the stock exchange - we are ready to work on BS. Otherwise - a step-by-step payment (made the stage on his server - checked - paid 50% - transferred to the server of the customer - paid the remaining 50% - moved to the next stage).

What are your proposals for the timing and budget of the development?
What pages do you plan to control the module in the admin?