Hi Alain, I can change the admin design and add CRM script as per your requirements, I assure you my work will amaze you. Please provide me CRM. I have expertise in core PHP, WordPress, Html5, Css3, JavaScript, and MySQL and have developed a lot of custom coded plugins and websites for WordPress woo-commerce themes.
We can discuss more on your project via chat session for a better understanding so, I can share my expertise/suggestions on your project, feel free to initiate a chat with me and from there we will proceed further.
Regards,
US