guys, are you not just amazing?! Thanks to you, fjtorres and kacir, even a monkey like me could tweak Kosta's
wonderful sheep theme, and change the settings so that you do not have to create the book directory
to see your books - which I wanted to avoid not to mess up things with Calibre transfers.
I left the "Journals" and "Documents" directory, and did not mess with either the German or Russian translations, as I know neither of these languages! I attach both the .pbt file (in a zip file because of the otherwise unrecognised extension) and the tweaked .txt that generated it.
Presumably the same tweak can be applied to all other themes with the requirements of additional directories.