Wordpress multisite to install webshops

For a newly setup business i want to deliver webshops to clients. (same idea as [login to view URL]) My website will run from shop**[login to view URL] (without **). From that site clients can order a webshop. That site runs on whmcs. You're job is to create a wordpress webshop (with woocommerce plugin installed) via wordpress multisite. Via multisite i need to be able to install the entire wordpress installation (including woocommerce, themes, extensions, languages) for all different clients. So, the wordpress shop will not be for myself, but for clients. But all clients receive the same webshop with 6 pre-installed templates, 4 languages and some extensions. The entire wordpress webshop must be very secure, so no hacking can take place. I know WP is not 100% secure. Custom work is : - to build a theme editor like this [login to view URL] (example) (each webshop has this theme editor and can use it for all themes installed) - build 6 WP templates, that can be edited with custom theme editor - modify the wordpress admin for easier adding of products. - Build a new wordpress admin layout - Link the whmcs system to wordpress multi site, so webshop get automatically installed. When bidding, please give me detailed info of what is possible and what not. I want to receive all information how this project can be created. No info = bid deleted