Yeah that’s right. Plus Metricon was also built almost “open air” ie without properly enclosed construct. It has open backing on most levels in most parts of the ground. They could get away with that, and the significant cost reduction, because of the GC’s great climate.
My understanding is as well, that the potential Tassie cost is also inclusive of a large commercial infrastructure around the stadium - much of which will be offset by commercial investors eg hotels, hospitality industry, retail enterprises etc.
Again, Metricon has none of that built into it. Chalk and cheese developments, necessities and strategies.