Trying to make this part and no clue how (Sweep isn't working)

Hey Everyone!

I am trying to make this part and its not working. I have attached an STL of what I am trying to recreate. I have tried using sweeps, sweeps with guided curves and honestly im a bit dumbfounded at the moment on how to do this. Can anyone help please

Help is appreciated! thanks

SolidworksParts And Features