Shed door plans as we have already said, the easiest way to build a shed door from scratch is to use a piece of 5/8 grooved plywood and several wooden trims. measure the door opening and cut the plywood, using a saw with a sharp blade.. The next step of the project is to build the actual door for the storage shed. as you can notice in the free plans, you need to use a piece of 3/4? grooved plywood and 1