Do you think that ancient humanity had the technology and knowledge to create its own set of halo rings as well as a couple of arks ?
I mean the book clearly states that they were stronger or equal to forerunners, so they can ?
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Maybe. I like to think Ancient Humanity surpassed the Forerunners in technological ability (hence their creation of a Flood 'cure'), and they only lost due to being outnumbered and weakened after the human-Flood war. I also like to think the 'Forerunner' crystal on Reach is actually of human design. It's clearly not Precursor as it would have needed the Organon to work.