For the Incubi we should look into chainmail. It will provide sufficient protection while also keeping them mobile. For the other Learning action, how about Electronics theory? It will help the big project as well as being thematic.
If we build the artisanal quarters and do another theory it should only take two turns even with auto-successes.1 Action would be enough for most projects, except for Pressurized Suspendium. That one needs a few guaranteed Successes.