My prototype code for the layered build has been posted to gerrit.  (listed below) I was briefly able to build all layers, and produce an iso with the same package content as the cengn build.  Then I was diverted by non-trivial changes to the restructuring work. What I have posted is now several weeks out of date and will almost certainly will not work.  The devil is in keeping the lst files in sync with the ever changing master branch. Other commitments will prevent me from resuming this work until November.  If anyone wants to whip the lst files into shape and try to get the build working again, be my guest. Final delivery will require changes to the CENGN build scripts (Don or Myself), and a freeze on packaging changes will likely be required for aprox 3 days to finalize the lst files. Scott ---------------- <Snip> ---------------- https://review.opendev.org/#/c/681821/1 https://review.opendev.org/#/c/681914/1 https://review.opendev.org/#/c/681823/1 https://review.opendev.org/#/c/681824/1 https://review.opendev.org/#/c/681828/1 https://review.opendev.org/#/c/681832/2 https://review.opendev.org/#/c/681834/1 https://review.opendev.org/#/c/681836/1 https://review.opendev.org/#/c/681835/1 https://review.opendev.org/#/c/681842/1 https://review.opendev.org/#/c/681847/1 https://review.opendev.org/#/c/681848/1 https://review.opendev.org/#/c/681851/1 https://review.opendev.org/#/c/681852/1 https://review.opendev.org/#/c/681854/1 https://review.opendev.org/#/c/681856/1 https://review.opendev.org/#/c/681890/1 https://review.opendev.org/#/c/681892/1 https://review.opendev.org/#/c/681892/1 https://review.opendev.org/#/c/681898/1 https://review.opendev.org/#/c/681900/1 https://review.opendev.org/#/c/681901/1 https://review.opendev.org/#/c/681902/1