If you are willing and able to spend an entire team for a quarter, I think you'd be better off for quite a while to just license Cloudability (now maybe Apptio). Its face value isn't "cheap", but for most companies, I think it's going to be cheaper than a team for a quarter plus the on-going maintenance of that tech.
(We're a long-time Cloudability customer; no other connection/conflict of interest here.)