Measure and cut two of the 2-by-4 studs so they are four feet long. These will be the back support posts. Put them aside.
Measure and cut the other two studs to four-and-a-half feet long. You will want to trim the ends of these planks at a 10 degree angle so they can stand flush on the floor while angling upward.
Lay out your studs on the ground so that you can frame one back stud with one angled front. Measure and mark the wall where you want the shelves to be.
Measure the distance between the frame's slanted front post and the back post. Cut three support beams of descending lengths from the remaining 2-by-4 studs for each frame. An example would be an 18-inch support beam for the bottom shelf, a 10-inch beam for the middle shelf and five inches for the top shelf.
Drill the screws through the posts into the support beams. You should have two screws per post on each shelf for stability.
Measure the wood plank to make three shelf sections. Each shelf will be shaped like a cone, with the straight sides of the cone being the length of the shelf coming to a 90 degree angle and rounded on the front. So the 90 degree "V" will extend with the narrowest portion in the back of the stand and be rounded in the front (or it can be cut into a triangle). You can use a string with a pencil attached to the end to mark a rounded top that will extend slightly beyond the shelf post. Mark and cut each shelf (3 shelves).
Screw each shelf into the support beam that matches the length of the cone. For maximum support, place a screw every four inches on the shelf. Do the entire right side first, then the left side.
Paint or stain as desired.