i recently upgraded to sid CS step C
i have part of the old CS, built inside a c64 new model, that is collecting dust
http://www.alchemystudio.it/Strumenti/SIDPhotos/SID_construction_(16.JPG
if you are interested in this, you just pay the shipping cost from italy… 
find some more photos here:
http://www.alchemystudio.it/Ebay/SID_CS_StepB.zip
all the things you see are included (although there are NO shift registers)
there are buttons, leds, a small PCB for the DIN… more details if you want it!
the connections should work, and i will control for broken wires.