I'm selling website templates to auto repair shops. They edit the templates offline, then upload to a server. Problem is, free hosting solutions like webs, yola, wordpress, don't allow you to upload templates. So, I need to have a system where I pay for hosting and sublease it to them. They log in, choose a subdomain (robstowing.mysite.com), and upload their template to the subdomain. They would have a user/pw to protect their account from my other customers using the same server. Any ideas as to how to do this?