Great welding tips. If you don't have a flat surface to start your project from then I can help. In this video I go through the necessary steps to reduce error in creating a flat surface. I use a three point system to work off a un even floor. My design of squares takes care of all three points without you having to do anything. If you don't already have have a welding table and want to build your own this method will point you in the right direction. Thanks for watching!