Your could have added a matching SP amount to the VESTS value that you extracted. For end users this is more valuable.

That's precisely what I have planned for tutorial 3. 😉 — I don't want to put too much into one tutorial.

via sufficient explanatory textual information.

The explanations are currently all in the comments. But I could beak up the code into smaller snippets and use text blocks for explanations. And I still have a few days to edit and improve.

There are several tutorials for Ruby/Steem on the official developer website in here,

I missed that one. Luckily there is no overlap yet. I'll make sure it stays that way. Also I try to make fully working examples with error handling.