I am currently checking the options for Membrane under Plone 5.2/Python 3 for a large university site.
Is actually anyone using/working/porting on these modules?
The primary source of update/migration states should be https://github.com/orgs/collective/projects/1
As for Products.Membrane you can see there https://github.com/orgs/collective/projects/1?card_filter_query=products.membrane @cillian (may you take over here?) worked on this already, but the state is unknown .
collective.castle is not on the list, so it would be good if you add it there. If you start working on it, please link the Issue/PR tracking it.
I had a look at it, but didn't get far enough to open a PR. I was attempting to replace the AT based tests with Dexterity tests but didn't get to a useful point. Unfortunately, I doubt I'll get a chance to look at it again soon.
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