It's great to see others doing it as well. I'm not a big fan of the plain index card, and it's fun to see others attempting to do this decades earlier, with a newspaper image pasted to the card, and stats added as well, so we've been doing this a while it seems
As to steps
1) Print the front on glossy sticker stock
2) Print the back on glossy sticker stock
3) Attach both to acid free comic backer board
4) Cut out the cards and signature window
5) Attach signature w/ acid free tape
6) Finish the "sandwich" with acid free double-sided tape
That's it in a nutshell. Besides lots of time looking up a photo and the stats, photoshopping it all, and then carefully spending your evening with an exacto knife...