@nprofile1q... Thank You for reply ... but its not the case.
Overlay(s) work well with 'poudriere bulk' command and Mariusz added support to attach them to 'poudriere jail' command ... and that was mostly ignored ... even as he followed general STYLE of the code.
That is the problem.
... and its WAITING there to be commited since September ... while the Poudriere code lives and is modified ... and every modification to Poudriere make that commit harder to just 'apply' ... its really a SYSTEM problem.