What modifications would I need to make to move an engine to the rear?

I saw a youtube video of cars with rear engine conversions. What are the basics of such a thing? How would I go about doing this to my own car (2002 eclipse spyder v6) or any car or that matter?Here is the video: https://www.youtube.com/watch?v=v4TzU5WU1FI&t=189s via /r/cars http://ift.tt/2rLZ3ht