Removing a surface-mounted shop light
I know exactly that model and it's a cheapie!   Yes, that middle panel pops off easily, just get into the slot where the middle panel touches the edges and start prying.   It will pop right out.  

This type doesn't have a ballast proper, just some discrete components placed in the end caps and the gutter you're about to expose.  Very hokey.  I do not believe it would play well with a plug-n-play LED tube.   

You can of course gut that stuff and rewire it for direct wire LED tubes.  I recommend the kind of direct-wire that takes hot and neutral on opposite ends.   Those endcaps with the integral tombstones are pretty cheap, and I would not want to have 120V between the adjacent pins.