If I wanted to make my own speaker cables, is this a good choice for wire?

IT DEPENDS!
Roughly 10 years ago Belden CLAIMED that a 'single strand pair' of their CAT5e Ethernet cable was capable of Audiophile grade transmission up to 10 feet.
That aside, we now have OFC, Long grain copper, Silver plated copper, Litz braided copper, and we haven't even started to discuss shielding or abrasion resistance. I cannot imagine using Cotton on anything.
I didn't see anything in your list that impressed me. What you discussed, I believe can be easily matched or exceeded by something simple like 'Cards 101' cable which is not too expensive and has great statistics. Now I am a huge fan of DIY but now in my senior years I have also given way to more abundant brands that can provide what I want at budget prices. The afore mentioned 1'01' cable can be purchased in any length up to 100ft and even at that there are options of running multiple lengths of that if you feel you need more size and 3 lengths could be braided. Options abound.

Mitch2
What I think you may have missed is that I was jsut giving examples and possibilities. AS far as the cotton fiber goes , you might as well go demolish some 120 year old house and rip out the electrical wiring and use that for you speaker cable. Who knows you might get some good copper that way too along with the cockroaches and other creatures that love eating cotton sheathing.

Mitch2

I guess next time you will have to use a bullhorn to get me to listen! hehehehe

Mitch2

Yes You are correct about CAT cable. The reason I mentioned it was that My first pair of good sounding cables were DIY from CAT5e cable, 27 pairs braided into one homogenous cable. There wasn't ANY measurable Inductance and the Capacitance only slightly high. Resistance was VERY low. Seldom would you find an AMP that responded negatively to high capacitance. When I first connected then My Volume rose roughly 3db which is huge if you think about it. Covered them with nylon woven covering and gold plated Bananas. I must say, when braiding these you can expect to have a lot of arthritic pain in your hands for a long time afterword. I ran these for roughly 15 years up until I got my first NAD amp and then graduated up to commercial cables.