This is a glass topped table, irregularly shaped, but rather nicely made. I can put a 16" laptop on it, and leave a good sized space for my mouse on the right (or left, but not as large on the left side, as it is on the right).
Part D:
The instructions are three drawings, labeled Step 1, Step 2, Step 3, and that is the sole text on the page. Note: part D shown in the drawings to apply to the base of the stand IS NOT INCLUDED, not needed, apparently, as the piece that is welded to the base replaces it. So Step 2 is wrong.
The screws to assemble the top to the upright are Allen-headed machine screws, and the Allen wrench is included, as are the required screws, and washers.
Yes, you need a rubber hammer (It may be possible to use a 4 by 4, but that is up to you). I placed it top down, on a leather chair, and tried to make the top "one with everything", and got a 'Zen' surprise. It still came off, until I placed it on the carpeted floor, took my trusty rubber hammer to the upright, WHACKED it solidly, and thus assembled it. I then added the upright to the top surface and the wheels to the base, and finally whacked the base onto the upright. (No dogs nor children were sacrificed to the gods of furniture assembly in the building of this stand.) If you have hardwood floors, I'd put a large towel on the floor, fold it to protect the entire top from contact with the wooden floor. I then tried to use it, as was intended, and NOTHING HAPPENED.
No, the top and base remained assembled as expected, but the mouse did not cause the display to change, either. If you want to use a laptop on this stand, be sure your mouse is designed to work on a glass surface, or be prepared to put a piece of paper on the glass top. (If, after testing with a piece of paper, BELOW the top, if you wish to tape it to the underside of the surface, its Okay with me.) There are mice designed to work with transparent surfaces, but, probably not 2 feet above the carpet/your feet. Be kind to electronic Rodents.