I think it would be good to have a follow on post with something that spoke to a) what key domain knowledge gave you a leg up b) what terms you got that let the investors feeling confident you would deliver without a product at the moment c) something that is repeatable to other founders.
To me, and I may be misguided, but it read more like a lottery-ticket funding rather than the hard work that and network that you had which shows your grind!
Just my two cents! Great read and congratulations again!