My .02. There are many snake oil cables out there, just cut a few open to see. However there are many good brands where the engineering and materials are sound. The problem is trying to copy these. It is costly to buy pure silver wire (like 6n+), special dielectrics, etc. Then you have to design it properly. Also consider your time doing this. It may be better for you to just buy a good set of cables and enjoy. If you like to tinker and have a good engineering background then give it a shot.
