On the standard border you created, draw a working drawing of the barrel mount. It is the steel plate you see welded to the DOM tube in the photo below.
It is made from hot rolled steel that is 1/8 of an inch thick.
It is rectangular, 2.0 wide x 2.25 long.
The large center hole is 1.03 in diameter.
The four, equally spaced holes are centered on the large hole. They are .29 in diameter and are located on 1.25 inch centers (distance from the center of one hole to the center of the another).
Be sure to fully dimension the drawing. Do not include any views that are not essential for clarity.
Here is an example of a working drawing.
Turn in a printout of your drawing, and save your drawing as BarrelMount_lastname.dwg