Spoiler:
Well we see the Alterran scientists (the faction would later become the Ancients) making the decision not to use the Ark of Truth & leave the Alterran homeworld, rather than face the Alterran radicials (the faction would whom one day become the Orii) & their supporters - whom apparently, if you beleive what the female Alterrnan leader implies, where greater in number than their scientific counterparts - choosing instead to leave in the big dome-like ship (which I assume to be a very early version/model of the Ancient city-ship, or the technology upon which is based). And yes, it does seem the intital lift-off sequence is remarkably similar to that of Altantis itself.
It is also niceo t see that has advanced as the Ancients were, their technology didn't always look so pristine & god-like (in fact the bunker the leaders of the scientific faction of the Alterrans was in looked decidedly less technological than what we have come to see of the Ancients we know in SG-1 & SGA) - which would again fit with the theme/times those Ancients found themselves in (we are taking millenia here in comparision to the present day) - a nice touch, I thought.
Also, the myth/verses in the Book of Origin about the Orii defeating the old spirits & casting them out (referencing their defeat of the Ancients & their decision to leave the Alterran galaxy to purpuse their own ends peacably, rather than risk bloodshed & all-out war with the Orii & their supporters) &
, 
& 
's finding the Ark of Truth in the ruins of the old Ancient bunker in the mountains above the City of Celestis also rings true the popular theory that myth is more oftne than not based on fact).
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