The subframe is in two seperate peices, right? so i could remove the front but not the back, or visa versa? If i find severe rust on the subframe, would it be possible to purchase a replacement?

Im afraid ive gotten in WAYYY over my head. WHen i started this all i thought i was gonna have to do was put new floor pans in, MAYBE new quarter panels, and a new paint job. Never in my wildest dream did i imagine all of these problems appearing.