Thanks for the advice. I do believe it's the case, yet at this stage I'm more likely to focus on the market and the users "Getting outside the building" as Stev

Thanks for the advice. I do believe it's the case, yet at this stage I'm more likely to focus on the market and the users "Getting outside the building" as Steve Blank coined the term. But I take " building a prototype from your answer ". Do you think there any other milestone(s) to achieve ?