Look,one model can take care of different growth/funding scenarios, no need for laborious replications. I spent a pretty amount of hours building both my solutions and product financial model (really, my forte). Just frustrating attracting angel investors to such a business model that has proven (competitively) to generate lots of revenue. Being on the finance side, I tend to have a disdain for middle tier VCs. Sorry for some of the angels who don't understand, that's more acceptable. But VCs, many don't know what they want: liquidity or high market valuation.
I hope my first points answer your thesis: "The challenge here is having several funding plans up your sleeve that show different growth rates and also stack up together."