UPA-6E ZENIT (YNA-6E ZENITH) enlarger, is there any manual available?

What do you mean by imprints? Sketches?
As long as there are no fixtures or padded inserts, no scheme to arrange the content will guarantee safe transport.
Though typically such case is carried by its handle, thus most heaviest parts should be located at the lower wall.

This sort of stuff:
http://www.pxleyes.com/images/contests/only-dirt/fullsize/Imprint-4da7d7f0be77c_hires.jpg
just made by the enlarger on the foam.