It helps that the design is similar to that of the Falcon 1, which has already been successfully launched a few times. It uses the same engines, and I think it

It helps that the design is similar to that of the Falcon 1, which has already been successfully launched a few times. It uses the same engines, and I think it has a lot of the same electronics. (Fun fact: they use Ethernet for their avionics, replacing what would have been horrible tangles of wires in older rocket designs.)