I have just used Kickstarter to fund a project to fund the development of 4 N Gauge wagons, on a much smaller scale than Dave is aiming at. Some companies do raise alot of money by using crowd funding. I suspect that model railway market may be unwilling to back such a large project at the start. If you were to kickstarter to fund a wagon first of to prove the system and move up it might work. Another approach is to use a different type of crowd funding platform where you look for business backs who bid to give you cash in exchange for interest (loan type) or percentage of profits (equity).
From my experience this is still a very new concept in this market, very popular in war-gaming, technology, food, music and card games. A resent card game on Kickstarter was looking for abot $7000 and raised about $275000, so it can be done. It must be said that crowd funding is not an easy task and takes a lot of time and thought to make it work.