[SoaS] Building the SoaS spin from source

[Martin Guy]

Hi!
   I'm trying to build Fedora spin "Sugar on a Stick" from source to
be able to give it to people on 32-bit laptops. I've found and
followed https://github.com/sugarlabs/sugar-live-build but that
produces an .iso that automatically opens "Journal" and won't let you
out of it, instead of giving the usual circular array of activities. I
assume I need the list of activities to install to recreate the
wonderful Fedora spin.
   I haven't been able to find any build-from-source instructions on
the Fedora SoaS spin site, so wondered if there's something I'm
overlooking

Any clues would be welcome

    M