Looking really good so far , i want to see it with the wood work .
Mark,
I have used "Low Noise Microphone Instrument Signal Cable Copper Braid 22 AWG" from Parts Express (Part #100-220) to very good effect on several amp builds/rebuilds. I have used it for very long input runs under the amp and it has kept them dead silent.
I have a Darling amp I use mostly for headphones. It is silky smooth and detailed - love it! I didn't build it; so, I can't take much credit for the build.