Need help with connecting bar assembly using inventor

I can do it in SIEMENS NX and give you the STEP/IGES file. Will the work for you?

I really need .ipt and .iam files as I am not familiar with NX

This looks like a first year college/school assignment. I can tell you the hex nut and the pin at the top you can find in content center. The modeling of the parts that are hardware shouldn't be too complex as they are just cylinders with different diameters at different lengths. The 2 castings can be modeled on a view looking from the front. (Direction the hole goes) You can do sketch of the overall shape and then trim away features afterwards.