My 1970 Duster 340 FM3 project

I might do a little more to it rather than just bolt the doors back on. Spoke with my neighbor, who fabricates full tube chassis race cars and everything in between, and he said if I pull the motor, trans, and k-frame, he could put the Duster on his frame table remove and replace the frame rail for me for a pretty decent price. Truthfully, I just don't know if I feel like messing with that or not. UGGHH! Why did I have to see that 71 for sale here in my town?!?!