Ask HN: financial model for SaaS business?

Does anyone know of a spreadsheet for building a financial model for a SaaS business?

I am looking for something similar to @ryancarson's SAAS Model spreadsheet on Google (http://jaxn.me/9KaU4e), but with assumptions that can be changed (like for creating best/worst case scenarios).

I searched HN pretty heavily and couldn't find one, but I could have sworn I have seen one posted here.