what are quinces main concerns during the play rehearsal?

Quince's main concerns seem to be the setting. At first he wonders how they'll get moonlight in the room for the lovers' meeting; Bottom solves this by advising him to leave a window open. The second concern is a wall, as in the play Pyramus and Thisbe talk through a little hole in a wall. Again, Bottom comes up with a solution citing that someone can play the part of the wall.