This enclosure for a custom GBS Control is based on Lord Voultar's excellent build guide for a GBS 8200 with some additions of my own. I've replaced the VGA output port with an HDMI converter wired in (Because who want's that clunky adapter stuck out the back?), and I've added a stereo RCA jack along side the component inputs. Audio is just passthrough straight to the HDMI converter. I've also included a model that has the stock VGA port and no audio ports too in case you just want it in the stock configuration too.

Watch Voultar's build, like and subscribe, get his solder joints wet and moist. "It's just that easy. Ooooh!" He also has his parts list in his video description.
https://youtu.be/1AVXhiTlmgo

Stereo RCA jack: https://www.amazon.com/gp/product/B013SYV9S6 (or similar)

Note that if you are going to add the RCA audio inputs you will also need to desolder and remove the 4 buttons on the GBS to make room. Those buttons are useless anyhow.