Not that there's any intense interest in this, but it is something I've thought about now and then. One point that's not too clear on the thread sunjan linked to is that there is such a thing as
shielded cat5/cat6 cable and connectors. Apparently STP (Shielded Twisted Pair) cable is standard practice in Europe, while America has settled on UTP. So it
can act as a super skinny four channel snake! The shield is a single overall versus one-for-each-channel as in a purpose built mic snake cable. But it works electrically (ground/shield for all channels tied together) and I would bet quite decently for mic cable sonically. As was pointed out, Cat cable is designed to accurately transmit very high frequency signal, so the twisting of pairs is very precise, hence the noise rejection very high (and I bet the capacitance is
very low as well). At least in Cat6 cable, there's even an extra step of varying the pitch of the twist for each of the four pairs to further prevent crossstalk between pairs. Note that premade Cat patch cables do use stranded wire.
CSW is a good source for STP cabling and connectors: try a 75' 4 channel snake (cat5e patch cable) for $25!
Neutrik even makes XLR style RJ45 connectors:
Just some idle musings...
Peace,
Sanaka