copy and paste update:
you can copy and paste the cannon the you built
you cannot copy other peoples cannons or the ones that you buyed
build mode for building a cannon so you wont get your cannon destroyed while you are building your cannon (command is /build)
you can copy as much as you want (actually there is a limit, so i say that it depends on your rank of cubedcraft)
you can open a list of cannons that you copied (command is /cannoncopy)
you can sell the cannons that you copied on a player tnt cannon shop (commands is /tntshop)
selling your copied tnt cannon by right clicking a cannon on your copied tnt cannons list
I don't this will get added due to the purpose of tntwars is to build cannons and destroy others. If they are safe in /build this can be abused and the game would basically never end. The copy-pasting would in my opinion just be dumb since there a cannon shop for the players that aren't experienced in cannoning and this would just allow you to copy-paste hundreds of op cannons and you would win or the server would crash due to many tnt explosions.
Step 1: Build an epic cannon
Step 2: Copy it
Step 3: Paste it everywhere
Step 4: Profit
"you can copy as much as you want (actually there is a limit, so i say that it depends on your rank of cubedcraft)"
Also this is P2W