Okay young man, before you grab that welder, hung the doors and have your screen so that you can check the gaps as you weld it together. As you tack weld it together, continue to close the doors so that you will see if it starts to pull. Same with the screen, once you have a few welds holding, fit the screen temporarily so that you know that everything is fitting. It is time consuming but you will appreciate that time when everything fits properly when the final fit together happens.