Hi Karn, you uploaded only the assembly. not the parts that it contains so we can't see the full detail. but this should be a cake in simulation. My suggestion, start simple.
If you havent' done so already, take a look at the simulation tutorials on weldments and static analysis.
Then once you're good with the concepts, start with a few parts at the end, exclude the rest, add a fake restraint and gravity as your boundary condition and then start building from there. If adding parts causes the simualtion to fail, you forgot a contact. Eventually you'll have the whole structure and you can replace the gravity load with the actual load (looks like you could get away with a force to make up for the block that is at the end) and the actual restraints (looks like fixed at the back faces).