Found: a couple of female RCA -> 1/8" mono adapters, and a right angle 1/8" stereo adapter.
The RCAs are for connecting the SK-1 up to the Core™. All I need is to find a suitable wall-wart P/S for it. While connecting it up, I grabbed some of the split-side conduit and threaded the Cheez-O sampler leads that were just hooked up, as well as the MIDI and audio lines coming from the DS-8. Now it looks really tight down there, but I'll probably replace it sometime later with a longer length of conduit of a different color. Not really critical at this point. Next piece of hardware is the percussion controller that is still closeted at this point. I'll be using a snare stand for it; fits like a dream!
The 1/8" right angle? That is for Portabrayne so I can use external speakers without accidentally moshing the cable or the laptop's audio-out jack.
x-posted between my journal and bassic_fur