I also made a unit filler that can take them up from 36 (six stands) to 60 (ten stands) for bigger games. This takes to form of a humongous spider the Night Goblins have found in a deep dark cave somewhere and have herded into battle by prodding it with big spikes. The spider is a Reaper Bones giant spider.
The front rank of the Night Goblins have nets. This strikes me as something of a must have. They chuck their nets before the first round of combat and anyone struck looses an attack. This is vital in keeping the goblins alive long enough for their weight of numbers to make a difference.
The other thing Night Goblins have that are really something of a must have is fanatics. These whirling loons can, on a good day, reap a terrible price on the enemy. Even if they don't kill anyone they are sure to disrupt they enemies plans. Or at least give us something to laugh about. These fanatics were converted from RPE's mosquito riders, with the addition of a dressmakers pin as a ball and chain.