I'm also very interested in this. I've been looking at a bunch of affordable, DIY cable/connector options over the past few weeks, including all the ones you mention - fututech, neotech, DH Labs, GutWire, IeGO, etc. My goal was to try and keep total costs for a 1 meter cable around $200. My Carver monos have fixed power cords. I'm running my VPI Classic Signature through an SDS and am hearing that TT power cords are not critical (please correct me of I'm wrong!), so am really looking at preamp, phono pre, DAC & CDP.
After all the digging I ended up just this afternoon ready to go with Neotech NEP, but couldn't decide on the 3001($20/ft) or the 3003 ($30/ft). For connectors I settled on the IeGO 8085 gold plated which I found for $80 for the set, as opposed to the Furutech FI-11 golds which can run around $140 for the set.
Then I, of course, keep digging because it all becomes obsessive, and I see that Take Five Audio (Canadian site) is selling already-made 3ft power cords using Neotech NEP-3003 MK III cable, a Furutech FI-11M-N1(G) wall plug and a FI-11-N1(G) IEC for less than $200 US! I don't think I can make them myself for that price using Furutechs!
So now I'm back to wondering whether to DIY this thing or just go ready-made. Curious how the Black Mamba turned out for you.