Well I am making progress on the spec ... slow but steady ...
I've "finished" a glossary of terms[1] that I could use feedback, polish, questions and comments ... best is to open an issue[2], or I can give you access to the project and you can make any edits yourself ... all changes are versioned so we can't lose anything ...
Dale
[1]
https://github.com/dalehenrich/MetacelloScriptingApiSpec/wiki/Glossaryofterms[2]
https://github.com/dalehenrich/MetacelloScriptingApiSpec/issues