As you already indicated one will have to coper with a quite soaked paper backing (developer + intermediate rinse).

The Agfa day-light tank I refered to above splits the backing paper from the film: the film is cranked onto the reel whilst the backing paper is cranked out of the tank. (This all is not obvious from the parts-photo I linked to.)


At the photos of the Kodak tank one sees two protrusions at the lower sides of the tank. Looking at the old Kodak graphic one might think these are to fix the lid, by means of two lugs protruding from the lid. However that description refers to a stand. Makes me think of a rocker stand with those two protrusionsd forming the shafts.