A Custom[PRIVATE] Multisite for my Organisation

My Organization requires a simple multisite where our clients can fill a simple form with content and with a few clicks get his/her website Generated. THE GOAL is Automation of the development process. We want to know can your team provide us this service?
a simple;
1) Signup By Completing a one page form and select Theme
2)Preview and Make Payment
3)Site is UP and Running