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.

It appears the marketing department has hacked into the engineering department’s technical text once again! That Cardas 101 discussed by @esarhaddon does indeed look pretty good but I do find the write-up interesting in that they call the cotton filler material the dielectric and the actual wire insulation a “poly jacket.” Mind games.

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.

RAMM audio OCC cable. Amazing. 

@esarhaddon 

I get it, and no slight was intended, at all.  Cardas makes good wire. I was just pointing out the promotional rhetoric in their document that ignored the “poly” dielectric yet referred to the cotton filler as the dielectric, since most DIY’ers prefer cotton.  Marketing slight-of-hand.