I will probably end up making up the cables myself, will have a look at paracord, I hadn't thought of using it but it is worth an experiment at least to see what it looks like.
At the risk of sounding like I'm self-advertising there's a pic of the paracord sleeved front panel cables I did as my first attempt on post 83 of my project. Click the pic for full size image. I've since crimped new pins on the audio cable. Heatshrink could do with being more even in length but you learn as you go. Main advantage is the cost but I prefer the more cloth-like appearance vs the shininess of 'normal' sleeving. It can snag a bit on sharp edges though.
Backplates but no cards?! That's like rubbing salt in the wounds!