It will be warped again when you are done building it...
I struggled with this some and there are ways around it..I couldn't begin to explain it here...I worked as a tank welder for 30 years and believe me plate welding is an art form ...basicly try to build it with the least amount of welding ..remember plate is mostly rooled out And shipped in a coil...coil steel...there is always a slight curve to it...
