Made an extremely long wood box car for sound capabilities

This wood box car is designed to fit a Mego LiPo Blunami DCC Sound system with all the sound chips, that way you can pull it behind a locomotive and not have to add sound to it and use it only when running. The electronics would be ungodly expensive for the single car, but if you have a bunch of locomotives planned like me that you're going to build one day, this car is perfect for you, as it cuts down costs in the end. I designed it for functionality to fit as much electronics as possible...