I've done a test with 2 units and it is possible to link to another unit but it opens a new window and I seem to only be able to link to the launch page (it doesn't jump directly into the lesson).
From what you know:
- is it possible to make a link that jumps directly into a lesson in Moodle?
- can the link open in the same window? (I am looking at ways on doing this on my end with Storlyine, but I wanted to ask your opinion)