Arthur,

> I'm sure that licensing won't be a problem.

Yay!

> Is it based on the original R7RS Small, or the version updated with
> fixes to errata?

All errata are encorporated (I followed the versions with errata that
are hosted on standards.scheme.org,) so no need for additional errata
links.

Thanks,
--
Artyom Bologov
https://aartaka.me