The secret for a glove-tight fit for trim corners is a coped joint. With this technique you can even make complex crown moldings fit without leaving gaps. http://www.familyhandyman.com/carpentry/trim-carpentry/how-to-cope-joints/view-all
They converted a wall outlet into an extension outlet for our TV room sofa table. This outlet, built into the face of the table, allows us to utilize the electrical outlet that is behind the couch - without having to move the couch out of the way.