Modify whmcs and add more Features

Hi, I am looking for all-in-one client management portal to be developed. I know whmcs is the best option. But i need some addition to this script and i want to use a nulled version, but problem is this Portal is going to installed for a legal user. So i want to use code of whmcs, but i also want to add more features. I want whmcs to be integrated in my existing design.

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So you need a template and some plugins?

Hi !!!

This sounds interesting . If someone has/knows a method for the same, please share it with me as well.

Thanks