I found my own remarks regarding my first installation and yes, don't install layout-subsite-integration.
• install the includelet's base applications (in my case faq, news and xowiki)
• install openacs-default-theme, layout-manager, faq-includelet, news-includelet, layout-managed-subsite, file-storage-includelet
• restart aolserver
• from the /admin page click on 'Convert to descendent subsite type' and submit
• from the /admin/layouts page register the includelets and configurare the layout
• choose plain navigation!
• set the DefaultMaster parameter to /packages/layout-managed-subsite/lib/plain-master
Hope this helps.
