Jumbo Hut was built in 1981 - 1982 by the NZFS to replace Angle Knob Hut which had been blown off it's foundation in May, 1980. It was upgraded in 1993, & again in 2010 with new cladding & in 2018 with tie-downs. See https://tarhc.org.nz/doc-huts/jumbo-hut/ Edit Hut
Would sleep more than stated as there is sleeping options above locked room, plenty of firewood which helped when everyone arrived wet, hut was clean, and cleaning supplies left to aid leaving the place as you found it, 3 outdoor sinks which gave everyone enough space. And the sunrise is amazing to watch.