Tell us about yourself!
I notice that the connector uses RCA jacks. Technically, couldn't you use an RCA to 3.5 adapter instead of soldering directly onto the board? If you drill a premeasured hole for them into the back casing, you could even make it look pretty slick, without the risk of ruining the board. Plus, if you felt like getting really crazy with it, you could screw on a line output converter to the outside so that you can hot swap it for use with High level signal input device.
Could a 20volt 1 Farad capacitor be used for this build?