Here we have Alamo TV Cabinet in the 72 x 20 x 29.25" dimensions. It consists of a 3 section unit with an open center section with 2 shelves.
The entire back can be removed to gain access if and when you need to do so and cord holes in the back are already included.
Let us know if you need to customize this, or any other cabinet, and we will gladly check with the builder to see if what you want can be done.