If you look at this from the side of the pcb there is little to no chance of any short circuit IMO I have been looking at this for a few day's, and mind you I am not a engineer but I have seen enough to see that this is really safe, as long as you complete the connections in the proper manor.
If the board fails it will be dead, If you or me fails on our part then yah it could be trouble just like any other build we do the safety is in our hands.