The top bolts were mainly shift+D the other were done by eye much quicker than playing around with curves......here is a link to the tank its a bit long winded if you cannot get to sleep it might help.........LOL..........dave https://simplymaya.com/forum/showthread.php?t=36437 sorry to ask dave, but does Shift+D work around on curved surfaces or then you have to align them manually !!