Sybille!, iddee:
The box or lid on top is supposed to keep the frames in place during transport.
My frames usually stick to the box. In the boxes that do not have a metal rail for the frame ears....
Sometimes, they come up anyway, of course. Happens with the Liebig-K?schden, too. Even worse, I think.
As for the lid and the beespace (which is certainly known to Sybille, thanks, iddee) on the frames:
I am a supporter of bee-space on the top esp. in a one-brood-box-system like ours (I just have 9 Dadant-frames in the box, you got 12). In winter, when they really need to cross to another frame, they cannot chew enough holes in the combs to succeed. They need to cross around the wood, if no tunnels are there (my opinion, that is).
In a one-brood-chamber-situation, they move to the top rather qucikly, as food is consumed. so they move away from the bottom bars (also number of bees declines during winter), where they could cross. Also, the front-bars are quite cold. On top, there is max. warmth and movement possible. So that would be the place bees could cross most easily. That is why I don`t use foil or wax-cloth (for my convenience). They could lift the foil, not the wax cloth.
Maybe my concerns are not valid, but I am not gonna try.
Little cracks between lid and box I don?t worry about since I know that so many American beeks have a top-entrance.
Hope, that helps. (copyright: THP)