Frustrated with inability to do body work!

Some say a carpenter has a good eye for straight and continuity. On my 66, I struggled as well....even with a carpenter's good eye....I think. Would photos or measurements help? I could send some off. I noticed finishing it off with high build. For sure, mild to aggressive on the mud to get close using hand tools for detail work, and finish it up with the high build. Yes, me too, if I were closer. Hang in there, and you will get what your looking for accomplished. Jerry.....Old Dart 66