So... You are a hardware start-up that doesn't actually do any hardware. I recall a guy who got seriously burnt by taking this approach in a kickstarter: he had

So... You are a hardware start-up that doesn't actually do any hardware. I recall a guy who got seriously burnt by taking this approach in a kickstarter: he had designed a iPad cover, successfully funded it and then proceed to crash as all his supply chain decided that wanted a bigger slice of that money. He even got sued by some random backer. I think you really need some expertise in what you are trying to build. It has to be really hard doing a decent cost estimation otherwise.