Having also completed the restoration of a ‘46 Chevy 1/2 ton, I think Harold has offered spot on pointers.
The list he posted, IMO, should be considered as the “to do/done” before beginning the interior.
A very wise, wish I could recall who, person opined when I initiated the restoration journey on Sparky that this is a “Journey that will take time, patience, tenacity, and money “. To that I would now add it will lead to an incredible learning experience, relationships building and sense of achievement worth all the frustrations and then the ability to help others as they tackle some of the same obstacles you endured and ultimately will overcome. Sparky took about 10 years to complete, working at least a few minutes each day on average and doing something to learn or inch forward on a task.
Harold helped me along the way, especially when it came to the wiring.
Good luck!
