oh yea will that happen lol...i had 3 back ups of my files..so i did not have to keep re building it..im trying right now to do a tutorial video but the biggest issue you will have is with the timing, it has to be just right or it ether dose not work...or blows up.
I've got a MCedit schematic for it. I'm currently working on a project that requires loads of TNT cannons of loads of types, so ill probably use the long shot. I've also made an extra-long-range one, which uses 18 TNT and a condenser charge, just to shoot one block. I also made a shotgun, which blew up a lot. 5etharama, AWAY