Was that just a building and doors for that price? That seems rather cheap for a shed, docking, gear pits etc. I would suggest the qantas quote included those plus GSE, tooling, phones, computers and most of the stuff required to make a major maintenance check happen.
I'd post the quote up here if I had more time to work out how. The price for a bare hangar with door, concrete, fire system, Jacking points, tail dock, design etc... is $16,129,700.
Extra $10,000,000 US also gets Fuse dock, wing dock, engine docks, hydro jacks, engine hoists, 4 x 90kva power units and removeable engine stands.
Quote does not include computers or phones. They may cost an extra $50k but knowing Qantas they would shop around and find them for $6m.