Removing frame rails & inner fenders questions

For this to work and not turn into a piece of twisted metal from a movie,allot needs to be done.Both cars need to be reinforced to stop twisting of either parts.The new front end needs to have two 2x3 square tubing bars installed to keep it straight when removed and a x brace.A 2x3 brace needs to be installed to stop the car from flexing and twisting when on the stands.This is installed about 6 inches back of the cut to be made.You could leave the K-member in place with nothing else on it to serve as the reinforcement bars? If this is not done,you could have a very uneven car and alignment problems and mismatched panels.This will have to be MIG welded and be sure to make measurements to be sure you are square when removing and reinstalling the front end.Mrmopartech