Huge racks were pushed out like the drawers on a chest of drawers

And I got it!

OLD
The weapon systems officer of the planet bomber touched the necessary controls on his station. On each side of the boxy hull, 1000 meter long panels opened and huge racks were pushed out like the drawers on a commode. Each of the racks held two thousand warheads; forty ton self-propelled crust buster bombs. Each of these Deep Penetrators held enough energy to pulverize a small moon.

New
The weapon system officer of the planet bomber touched theneccesary controls on his station.

On each side of the almost boxy hull of  huge drawers were pushed out, almost like the drawers of an ancient filing cabinet. Two one each side and e ach of the racks held two thousand warheads; forty ton self-propelled crust buster bombs. Each of these Deep Penetrators held enough energy to pulverize a small moon.