Nice job, Kusha!
Your CAD has definitely improved- exponentially. A few suggestions. 1) You'll see the C stock on the front and back has an orange border. you have a sketch with nothing on it. if you double click the part to open it, you can either delete the sketch, or remove its visibility.
2) The bolts- while CADing them like this works, I would suggest using the bolted-connection generator under the "Design" tab on the ribbon. It's efficient and works really well.
how to.
Good Luck!