375440 prestashop -install on the fly

I need a solution where my web page users will be able to fill a simple (php) form (email, password, username = subdomain), and then PrestaShop ([login to view URL]) will be (automatically, without any manual step from admin) installed on the fly and its access data will be send to user. The point of this is, i will offer prestashop customization, and i want my visitors to have a "test drive" with prestashop on a personal installation. Every installation will include preset orders, clients, Products, themplate.... I prefer prestashop to installed on subdomain, like user434.mydomain.com. You will get full cpanel and ftp acces to account. All demo instalation will be placed in one cpanel account, and you will (probably) use wildcard dns for creating subdomans on the fly.