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!
If anyone thinks this, email me and I'll tell how much it's not the case. It was really hard. We got rejected A LOT. Like most companies. That said (and going back to the point I didn't make very well), every company is different. Don't let one person's experiences box you in.