[NWA58]

If I could turn back time, I would have scrapped my twisted cab and found another. It has cost me lots of time, money and frustration and my truck is still not finished. Doors not fitting is a huge red flag. Here is what I would suggest:
Use the cut cab if it suits your needs
Sell the c-10 chassis
Keep the good parts you may want to use
Buy another cab and frame or roller project and blend the best of what you have
Know what you want the finished product to be and work toward that.