Greetings,
We have checked on and understood the Asikart UserXTD component and are confident that we have the expertise and the competence to extend the features of this component as per your stated requirement.
As for #5, unless you are seeking simple mail based communication we would suggest integrating the component with some ready to use chat component. A chat component is a complete application by itself and developing that separately would greatly add to the costs.
Please note that your mention budget range is inadequate to provide all the features that you have sought. We have bid what we believe is a fair cost for the stated functionalities.
Our competence to work on your project can be assessed by visiting our profile page. A check on the nature of the projects completed, the reviews received on such projects, and the repeat client rate would reflect on the quality of our work, our capability to deliver and the confidence our existing clients have in us.
If you would like to further interact with us before arriving at a decision, may we request you to initiate a chat. We would be happy to answer all your queries and concerns.
Regards