Ok, i just took another look. The space where i though a FPU might fit? Fits exactly on the 68000 of the classic. At first i thought nothing of it, but it might be that the pins of the empty connector make contact with the pins of the 68000. However, it doesn't look very exact, i would at least have expected some screws or so, so that the card always has good contact.

Do you think the empty slot seen in picture 5 of the first post could make reliable contact with the 68000 pins? Would that even make sense? Or is it just so that the card is in the right position for the small power connector board?