i dont think anyone would rewire the "whole" car for $800 from scratch including new wire, even reusing the old connector housings.
Maybe debug and repair a section like the EFI harness or Dash harness.
The car would have and engine main, EFI, dash, floor, boot, both doors and roof harnesses. It would be a months work to remove all that, and re do it.
I would have though finding the chopped harness would have been pretty easy if you were looking for reasons behind your harness bursting into flames.