Modders over at ZDoom - DBThanatos, Major Cooke and Michaelis, with the help of Neccronixis - are making a mod for the original Doom. The idea is to put the new Doom weapons in the game! As yet unreleased, they have released some video footage of their progress so far: http://www.vg247.com/2016/05/27/someone-brought-the-weapons-from-new-doom-into-classic-doom/