Welcome! Anything is possible and a Duramax would be cool, but........
, I think you would have to beef up the frame and suspension quite a bit because the weight of the Duramax (take a look at the factory Duramax chassis sometime, it is Ginormous!). A lot of guys use the older dodge diesels for this conversion because of the reduced weight. It might be worth waiting until GM comes out with their smaller diesel, I think it will be more practical. Just my 2 cents. Take care.