It is definitely possible. In fact, you are left with 15 voxels you have to remove at the end... Don't forget that you can still use the connecting voxels between the arrow heads which are seemingly stuck and not usable - you just need to nudge the end one so it pops on the second layer and then it can be moved freely. To do so the end voxel must have an empty space on one of its sides and another voxel on the opposite side: _XO (_ is empty space, X stuck voxel to be moved, O - another voxel). If you nudge X on the right, it will pop over O.
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