Great story, Ron!
Even though a lot of people associate Elvin with an 18" bass drum, he actually played a 20-12-14 during the late '50s and early '60s. Some of his most famous recordings were done on Gretsch 20-12-14 kits.
First he had a 3 ply 20-12-14 BDP kit, with COB stickchopper hoops:
[img]http://www.drummerworld.com/pics/drumpics34/elvinjones450.jpg[/img]
Then at some point he switched to a 6 ply 20-12-14 BDP kit. This kit is in tons of famous photos and videos of Elvin:
[img]http://jumpstreet-band.com/wp-content/uploads/2008/05/Elvin-Jones.jpg[/img]
At some point in the early '60s Elvin switched to a White Satin Flame 18-12-14 kit, and also toured with a 16-12-14 kit in a sparkle finish (all of the pics/videos are black and white). He continued to use the smaller bass drums for the rest of his career, unless playing on a house kit with bigger sizes.
So, Ron, when you bought your 3 ply 20-12-14 kit in 1958, that was exactly what Elvin was playing during those years!
As for the 6 ply BDP 18-12-14 kit in the article, I've never seen any photos or film of Elvin playing that kit. I'm not saying that he didn't, I've just never seen any evidence of it. It's likely he had this kit around the same time as the 6 ply 20-12-14, or maybe just had two different bass drums with the same toms, and didn't use the 18 much.
Thanks,
Bill