That’s great question. When you design the sign you add all your hole locations on backer and cut the outside edge exactly the same as your backer. this way all you do is lay your front cutout with all the letters or pieces so there perfect. no messing your trying to make it straight. it does cost you a little extra metal sometime but trying to get things lined up is tough. Most of the time fronts and backs meet up like the Harley sign. I use stud welder because it don’t leave marks on the front of the sign. It’s awesome but crazy expensive for hobbyist. Maybe for a business it would be no problem but i found myself a used one for reasonable amount. Let me know if you have any other questions. Happy to help