The reason I personally did not back it was due to obscure funding campaign. The low initial target suggests project has all in hands (factory, blueprints, parts even perhaps) and needed campaign just to support assembly. However that means they should have working prototype - shouldn't be a problem to assembly something for themselves to ensure it all works together. However there was none (only renderings). So my position is to wait till at least single working sample and only then back it. As it stands - there's still none.