Nick, Sorry to leave you hanging for so long. You have a lot of questions to address. The front fender brackets are group number 8.141. I can send pictures so you know what to look for. They fit '39 and '40 1/2, and 3/4 ton trucks.
I have a '39 1/2 ton (JC) pickup. It has been apart for many years.
Your bed was spaced off the frame with wooden blocks. I think there should be more of the cross channels that support the floor planks.
I will look into your floorboard situation. I just checked my 1949 catalog and there is no mention of the '39/'40 truck there.
Pleas feel free to email me at my direct address below and we can exchange phone numbers. I will be glad to help you.
Oh...dash knobs are plastic. You have quite a job ahead of you on that masking removal.
Mike
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