need input of wordpress solution.

Hi everybody. i’m thinking of using litepress for user profiles on a project i’m doing using the sub domains plugin to lock user’s into their subdomain / info. i’m thinking that i can run a mass word press for the users, and another for the site owner blog and forums. all the templates will be custom templates

just wondering if this is a bad idea in the making. also this will all be running under either apache or lighttpd on a dedicated server