I started working on updating the themes when the RC1 pre-release was in Github. A few days later they released RC1 so I figured I should start over in cause of any major code changes that may affect my work. RC1 does contain a number of bugs according to others. I've only found a few but have not really looked for any just yet...too busy working on the themes.
I 've been working on one theme but had problems and then switched to trying another hoping it would be easier. After a few days I was informed that I needed to disable minify JS anf jQuery in the admin while updating themes then things started falling into place. Here's the original theme using SMF 2.0.15:
https://skhilled.com/smftest/index.phpAnd here's what I'm working on in 2.1 RC1:
https://skhilled.com/smfrc1/index.phpThere's still a ways to go before completion but I'm getting there and learning a lot! 8) I may even change a couple of things to keep up with the times but they will mostly stay the same.