Extend Functionality of WHMCS Module

General information for the website: We resell Vultr cloud servers through WHMCS
Description of requirements/features: I am looking to extend an existing WHMCS module to include more functionality.

The current module can be found here: https://github.com/qmwl/Vultr-Module-for-WHMCS

The template files for this module are also attached.

The module is a provisioning module for Vultr cloud servers. It is a good module in terms of looks, however, it does not have some of the functionality that is possible with the Vultr API.

The functionality I am looking to add is the ability for customers to:
-Take snapshots
-Backups
-Add and modify startup scripts
-Add and modify SSH keys.
-View usage graphs
-Add additional IP addresses
-Assign their servers to our predefined firewall policies

We would also like the customer view to have a tabbed layout for different sections of functionality, in a similar way to the attached screenshot, whilst keeping the overall look and feel of the module.

There is an official Vultr module here: https://www.vultr.com/docs/vultr-whmcs-module
This module allows some of this functionality, but the customer view layout is not good and it does not allow customers to delete their servers and it does not automatically create the server once the order is completed.

API documentation can be found here https://www.vultr.com/api/

The module must also be updated to be compatible with WHMCS 7 and PHP 7.

I will be reading all proposals thoroughly to ensure that you have read and understand my needs. Please make sure that you mention some of the functions that I require in your proposal so that I can be sure you have read the specification
Extra notes: