Thanks guys
It was a lot of fun.
The whole thing took about 9 days. From writing the report to writing the sales letter to selling 150 copies. But could be done in 5-6 days too.
I don't have a backend product in mind - nor do I plan to create backends for this (because this is just a side venture for me) - but backends would take things to a whole new level.
I think Hotsheets are a superb way to test the market and launch a venture.