The best thing to do is to talk to a specia;ty company who cuts gun blanks - - - Wineland Walnut, Goby Walnut, etc. They may be able to help. The iron sticking out of the tree is a huge problem.
The only fix may be to get the tree dug and pulled out of the ground with a backhoe [a really big one] so the valuable root ball can be saved. Once down, a metal detector and large chainsaw can down siz the pieces a bit.
Once you have things to a hauling size, find someone with a water knife mill to cut the flitches. Limbs matbe with a chainsaw to get them small enough to evaluate and dry.
