Can you go get a pre-sale for one product?
Forecasted sales almost never come to fruition.
Get any pre-sale and you've got something.
Or, why not raise a standard angel round on the deal? Sell the vision. I don't think angels will care about your forecast at all. They'll just care about your team, background and potential for the company (IE can it make $50MM+ and are you the guy to do it).
I'd stay away from loans with a startup unless you have the sales to pay off the interest and a very real roadmap of how to get more money.
Im not an expert but I feel you are placing too much faith in the forecasts.
Who cares about the forecasts anyways, go sell the vision :)