Very cool stuff ! I've wanted to have that for some time now. Are you sure about the conversions ? some other websites like steem.rocks give a way more conservative estimate.
edit : I realized that it shows the total rewards not the rewards that the author gets.
Although I kinda dislike that you have to click on "reward" to get the value, it would be better to just set the price clickable and then if you click on it you get the sbd/steem value no ?
Part of the idea was to remove the intense reliance on price when voting a post. Vote for content, not for curation rewards.
If I do return the payout amounts, it will at least show the proper amount of USD value, not some horribly incorrect version that is assuming SBD is $1 as designed