First of all, you should know that you need 4 parts to get the Sliquifier in Black Ops 2, the Die Rise map. Getting them is not the easiest thing to do, as you can imagine, but there is a guide on how to get them and where to get them from and you can check it out below, for the exact locations of all the parts:
So good luck on getting to the workbench and getting you Sliquifier in Die Rise… and have fun wreaking havoc with it!