Business model for a Digital Studio of makers

Models I know:

Classic: act like an agency. Find clients, pitch, get a contract, deliver work, get paid. Milestones based intermediate payments during the project is possible.
Outsource: Find client, pitch, sell them developer/marketer they sit at the office of the client but they are your employees. Get monthly payment until the client builds their own team or do not need the extra power anymore.
Startup studio: Find client, pitch, get a contract that gives you equity options and hard cash, what and how many depend on your delivery and the success of the client.
Startupish: act like an agency but try to build your own products based on the experience.
Productized service: act like an agency/consulting than identify work which can be productized but still a service delivered by developers/marketers but very standardized so it scales better than classic agency work.