Recently I heard about people bolting on a Crown Vic (2003-2011) front end. I heard the 2003 aluminum frame is pretty stout.
A quick search indicates it's been done. Is it easy, that depends. Are you a good welder, both aluminum and steel. If yes (as in you've welded for a living at some point) then it's likely a fairly do-able thing. If not, then all bets are off.