My curiosity regarding DSD 512 is going to be assagued with a Holo Audio Spring (stage 2). I still intend to build the DSC-1 but it will be a slower project than even first contemplated. Strictly for fun.
Mouser in Australia has the Nichecon 22uF 50v UKZ Muse Electrolytics on backorder until May 2017. I tried a Canadian parts supplier who returned my money saying it would take them 8 weeks to get stock. I opted to buy some on eBay from Hong Kong, but there does seem to be a continuing supply issue for hi quality electrolytics.