Mary, you're right. I think I'll try keeping it simple, using a "topics" moodle course format and applying this kind of mapping:
| Sensei (source material) | Moodle |
| course | course |
| course | module | course | topic |
| course | module | topic | course | topic | page |
| subject matter within each topic | subject matter within each page |
This provides a starting point. After reproducing the sensei course in moodle, we can begin to build in more interesting combinations of resource and activity, so that we refine the course to our students needs.