Robot Rigged 3D model Low-poly 3D model

The files that were provided were not ready to use out of the box. When opening the FBX file the model is stuck in a position where the left arm is going straight up through the head neck and chest. The bone structure is non standard and as a result I had to pay someone as much as the cost of the model itself to fix before it could be used. There are no material maps associated with the FBX file. Other than that, its a cool little robot. Just realize that there will be some work required before you can actually use this model which, is not what you would expect when you pay for something sold as complete.

kept crashing maya when referencing or using direct file. UV was not unwrapped (they might have been once but now they all overlap due to combining mesh as some stage after) - and texture files where not able to repair via re-linking files. had to keep going to show polygons and nurbs only due to the way it was rigged (could not just hide joints in the outliner coz it would hide controls alongside of joints associated). Joints where hard to follow on what to select for baking out my animation so i can send to unreal engine. it is a cool looking robot and controls are great to use when it wasn't crashing. but was a mish to understand - i do a bit of rigging so i could follow some stuff but just wasn't user friendly. I am wondering if the crashing is due to the "sets" in the outliner? there is A LOT in there and the only time i have come across sets like this is when delete history has not been used during the processes. could be wrong but this is the only thing that i see different from any other rigs i have created or used. if it wasn't crashing after a few moves i would live with the rest coz it is a fun little bot. so if you can tell me what joints i select that will bake my animation properly and something that could lighten the maya file so it is more stable to use than i would be very grateful. thank you