I found this talk about re-structuring and bringing back to life a 1.2 MLOC lisp codebase with classical LP interesting (it's a bit meandering, but INHO well worth a watch):

"Literate Programming in the Large": https://www.youtube.com/watch?v=Av0PQDVTP4A

The reorganization is still ongoing, as can been seen at: http://www.axiom-developer.org/axiom-website/currentstate.ht...