46gmcpu...I understnd your frustration but hang tight. Some of the guys that can help you may not have visted yet. I'm sure you'll find some bolters that can help and there are probably a few close around.
..also,not everyone visits here in the welcome centre so try posting questions in the most appropiate forum which will get you many views/answers.
My neighbor is working on a 50 GMC but he's not very far along and is looking for stuff as well. Good luck on yours and see ya around the garage.