Since I thought I saw an Adapteva person posting here earlier:
If the Kickstarter falls through, what options could you still make available to hobbyists? Is there some version of your current prototype setup that you could sell, even if it's not one convenient board?
We would rather not think of that option:-) if the ks project fails, we'll do our best, but seems unlikely that we could support selling kits to hobbyists and they would certainly cost thousands of dollars each due to a lack of volume.
If you don't reach it in time, collect pre-orders. Seriously. Getting an escrow setup in place that in effect gives you a similar payment mechanism as Kickstarter (money handed over to you once the $750k is met; returned if criteria are not met) does not need to be expensive. Even without Escrow I think that if you get close to the target, a substantial number of those of us who've committed on Kickstarter will be ok with taking the risk. And it'd let you set longer/more flexible terms to make reaching it easier.
If the Kickstarter falls through, what options could you still make available to hobbyists? Is there some version of your current prototype setup that you could sell, even if it's not one convenient board?