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
but, have u figured a way to reload the semi auto one, i dont mean the charge and projectile part im talking about reloading the the part that reloads the gun.......my friends and created a system where, u had detonator (the one who fired the gun) and a reloader (basically u sit there placing one TNT block in one spot while it reloads the reloading feature on the gun.
well the way mine was designed it uses the gravel blocks to push the tnt..so as a tnt block gets pushed the gravel falls into place allowing more to be pushed....im sure i could design something to reload the reload..but i mean where would it stop...makeing a reload for the reload for the reload..hahaha...also the more complex it gets the harder it is to compact. honestly after linking them all together and firing all those tnt blocks I dont mind going and reloading every thing. the way me and my friends worked the pirate ship was very similar one person to fire and one person to load. but i really dont think i could add more I could barely make the 4 of them fit in that battleship all linked together..it also took forever to get the timing right. I would love to see your system.